Wanderer wrote:
They're all D whistles...I bring a mix of high-enders in case I run into other whistlers who want to try them out. It's a public service

Ah, I see! What a cool thing, sort of a travelling D whistle exhibition. My setup does have the problem of having nothing to loan, unless I loan my high D and play my Low D.
Years ago I had just come off stage (playing flute and whistle with a Celtic band) and a guy came up and started chatting whistles.
He said he had around 200 high D whistles. He started rattling off names: every maker I'd ever heard of and plenty I hadn't.
He didn't have a single whistle with him. Was he a player? Or a non-playing collector? I'll never know.
I'll wager one thing: that if I played all 200 of his D whistles there wouldn't be any that I would trade for my 1980 Feadog.