Today, I just recieved a low D and a high D whistle made by Mack Hoover. They are really awesome! This is my first low whistle, and I am really enjoying it! It is also my first PVC instrument, and I like the PVC a lot better than I thought I would. 
The high D is a very nice whistle, as well.
Collin 
Yes, it is official. Hoover whistles are awesome. 
Congrats.
I have a number of Mackās whistles. Yet strangely, I do not yet have enough. He keeps making it more complicated by coming up with great new stuff!
I have six pure Hoovers, and Whitecaps on Feadog and Oak tubes. Iām sure this isnāt the end of it.
I now have three of his CPVC whistles (high E, high D, low G), and I really like the soundāa bit more resonant and less pure than the metal ones. I also like the way they look. That off-white CPVC that he uses is more ivory than whiteāvery pretty, really.
Iād be interested in hearing more about your low D after youāve had a chance to play it for a while.
An added bonus is dealing with Mack, himself. Every maker/tweaker that Iāve dealt with has been extremely pleasant, but I must admit that I always particularly look forward to placing a new order with Mack. That must be how Iāve ended up with to many of his whistles.
Also, if you want a whistle made from some odd bit of tubing, Mackās your man. He made me a fine low A out of an old piece of bamboo that Iād had lying about for decades, and I know heās managed to create whistles out of things like ski poles and arrow shafts.
Darwin,
Iāve been playing my whistles nonstop I recieved them, except when Iām at school. My low D (my first {and definetely not the last 
} low whistle) is a blast to play! Iām still trying to work on a better transition from C# to D, but Iām not worried about that, for that will come with practice. It is quieter and takes a different amount of air than my high D. It has an amazing range (compared to any whistle Iāve ever played), about 2.5 ocataves. It sounds great played with guitar. Iām looking forward to eventually getting more Hoovers.
Collin
Mack is also a really fine businessperson. He replaced a whistle of mine that had a freak accident and broke.
iāve got the brass high d and a pvc low g i got just to make the transition to low whistle i was astounded by how good the pvc sounded and looked im going to order a low d pvc from him in about an hour [doing my own christmas shopping] ive also got a burke high d luminium black tip that i like alot but played side by side the hoover just sounds better
And shower curtain rods! Iāve played all three, itās pretty amazing what he can do with just about anything that resembles a tube.
Collin: Please check your PM.
Best.
Byll
For sure, Mack is making some real fine whistles. I am in that pleasant state of mind that occurs when you know one is in the works for you. In this case, it is a Black Top (delrin) D. If not tomorrow, then the day after. If not then, probably the day after that. It matters not. The expectation is an integral part of the dealāa pleasure that is exceeded only by getting your hands on that shiny new puppy!!
Tom D.
Mack is a terrible āhoss traderā, though, 
I sent back a blacktop fipple I wasnāt pleased with, and I asked him how much he would charge to trade it for his tunable brass / plumbing tube Whitetop in Bb, and he traded even. The only ābootā he would accep was me recording some sound files and letting him use them. 
It was a different design than the others that I had ordered previously. The tube is all plumbing tubing and the brass is in the fipple. I believe the blade is of brass, too. It should be a simple matter with this design to perhaps have one head and several tubes, but Mack would have to confirm that idea.
I was thinking, since I had a stick of that sized plumbing, I might play around with a design I have been thinking of, since I also try to play the uilleann bagpipes. I want to make a āback Dā and a āghost Dā hole and see if it helps with my bagpipe fingering and ease the crosss over learning curve for my pipes.
Fancy Piper points out that āMack is a terrible āhoss traderā, thoughā¦ā
Indeed, of the many things that might be said of Mack, the suggestion that he drives a hard bargain will certainly not be at the top of the listāif on the list at all, for that matter!!
Tom D.
I have a charming brass D with a green Corian-looking fipple plug that Mack made for another Chiffer. It plays perfectly in both octaves, all the way up, and at a petite volume that is just the thing for playing indoors when you donāt want to aggravate the neighbors. Itās nicely responsive and enjoyable.
Iām sad to say that there appears to be a bit of corrosion beginning inside the whistle, so Iāve been wondering if Mack could polish the interior. But, it still plays well, without racket or squeak.
Lambchop,
I have one of these as well. Itās Mackās āTraditional Boreā adjustable, all brass. It even has the same green Corian-looking fipple plug! I couldnāt agree more with your comments. Of all the whistles I own, itās the very best for any tune that requires playing sustained notes above second octave G. It just has a beautiful sweet sound and is a little jewel of workmanship as well.
I think he told me he uses a gun or possibly a shotgun cleaning brush to clean/polish the inside of the tube.
I used a piece of chamois leather and a wooden dowel and pushed the leather back and forth in my Generation C and Bb tubes to polish them up.
Iāll be darnedāit arrived today, along with one of the unsolicited goodies that I undeservedly receive from Mack from time to time. The āitā in this case is a Blacktop D on one of those two-piece Clare (or Doolin?) D bodies that are so surprsingly fine once you get a decent head on them. I tried it out after dinner in DSL-land (Dowling Sound Labs, aka our buildingāc cavernous garage) and it is a fine instrument, to be sure. I am not as gifted as Philo when it comes to describing the qualities of whistles, but I sure like it a lot.
We live in an apartment building, and packages are delivered to and held by the doormen. The evening guyāthe guy who is on duty most weeknights when I come in from workācan now tell by the look in my eye days ahead of time when I am expecting a delivery. When he receives a mailing tube or one of Mackās virtually indestructible three-sided cardboard mailers, addressed to the Dowling household, he knows that he might as well hand me his jack knife to open it with ay the same time. He has grown tired of seeing me try to rip these packages open with my teeth, right there in the lobby (the accoustics are great!!) Iāll admit itāIām like a kid at Christmas when it comes to the arrival of new whistles. (Or is it that getting a new whistle just keeps us young? I donāt know, and I donāt care.)
I just know that now I will have to try to come up with something to send Mack that at least begins to approach his generosityāa generosity of both spirit and workmanship. That is a tall order, and I am running out of ideasā¦but I will come up with something. It says something about a whistle maker when your first thought is that, over and above what you may have paid for the instrument, you want to send the maker something more. That is one counter-intuitive business model, for sure, but it works for me.
My thanks to Mack and the other fine whistle makers whose good work-- and good works in a broader senseādelight us and enable us to find and refine the music that is in all of us.
Tom D.
(Happy as a Clam!!)
I have a Mack narrow bore D whistle. I never see it mentioned on these boards, but its the one I like the most right now. It takes a bit to get used to where the holes are because they are so small you canāt feel them. But now that Iāve grown acquainted with it, it just fits me. The sound, textures, and quietness. Oh, and its pretty too.
If only the gift of playing well were to followā¦I look forward to trying out some of these Hoover gems soon.
Philo
Well Philo, Tommy D. got some new toys today to go along with the whistlesāa Behring 802 Mixer to boost the SONY Mic a litttle and provide a stronger front end for the Cakewalk Music Creator 2.0 that he can barely understand. And, while at B & H I got a new R320PhotoStylus Printer, though I will admit that has a more tenuous conection to the whistleāhowever, it apparently prints directly to CDs. So, once we negotiate our first recording deal, we are GOOD TO GO!!
Come on over and bring the Bloom with yaā!!
Tom D.