Hi, has anyone reeded, or plays, a Ginsberg B chanter? I’m looking for a reed or reed dimensions, to reduce the guesswork 
Not sure I can tag people on the forum, but Sam Lawrence made a great reed for my Ginsberg B chanter a couple of months ago. It’s playing very nicely and his rates are very reasonable!
Yep, Sam’s a friend, I asked him earlier on and he couldn’t remember exactly what he did with your B but I’ll tell him you’re happy with it, good to know 
Prehaps Alan Burton has reeded a Ginsburg reed sometime over the years. You could contact him.
Not Ginsburg I know but Here’s Alan’s take on a Williams B chanter reed, from 2011:
Williams B
Posted on January 13th, 2011 by svpribyl
Reed Made By: Alan Burton
Posted by: Steve Pribyl
Reed Type: Chanter
Date Constructed: unknown
Pipemaker: Dave Williams
Key: B
Staple Type: Rolled
Staple Details: 3.2-3.4mm ID
Staple Length: 52mm
Head Material: cane
Head Width: 11mm
Cane Tube Diameter: unknown
Overall Length: Unknown
95mm long slip
Form on 65-70mm diam block
Staple>head 20mm
from http://uilleannforum.com/forums/viewtopic.php?f=4&t=1278&p=8491#p8491
Also from Alan Burton regard. Williams B and C chanters, 2009:
I have successfully reeded a handful of Daves Bs & Cs. You should be okay with the following:
Head 11mm wide (perhaps a little wider for C?), 95mm long slip. Form on 65 - 70mm diam block.
Staple 3.2 - 3.4mm ID, 52mm long. Staple>Head 20mm.
Pretty much standard really (Alan Burton).