Sorry to be so ignorant but I have a question.
Q. What is the difference between a Tin Weazle and a Paul Busman,they look very similar or even the same,am I missing something here?
Also,some years ago I came across what I now know to be a Rosewood or something similar Tin Weazle in a Pub called Mike Murts in the village of Cahersiveen in Kerry.It was left there after a session one night and as far as I know It’s still there in the window.It was one of the best high D whistles I ever player but no matter how much I begeed, Mike would not sell it to me,so if you are the owner ,it’s still there.
Phil.
Phil-- I learned whistle making from the great Glenn Schultz who makes Thin Weasel whistles and flutes . You can see them at his site: www.thinweasel.com .
His D whistles and mine are indeed very similar and are made to many of the same specifications. These specs were given to me by Glenn with the understanding that I was free to use them as I saw fit. Glenn uses different fipple materials, and his current D whistles have a concave fipple. Our ring designs are cosmetically different, and our tuning slides are reversed: I have the male half of the slide on the head, Glenn’s are vice versa. I haven’t seen a recent D of Glen’s, but the ramp of my old Thin Weasel is somewhat different from the ones I make.
Glenn makes a much wider range of keys than my C,D, Eb (from a low G up to an amazingly wonderful high G) and does not make any acetal (generic for Delrin) whistles. In the plastic field he makes the excellent PVC Water Weasels. Each of his keys (for wooden whistles) has a distinct tube diameter while the three keys I make share the same ID and OD.
Beyond those differences, the maker’s hand introduces little intangible variations.
In playing characteristics, the Busman I have has considerable back pressure compared to the Weasel which is average.
In tone quality, the Weasel has a purer tone, the Busman is mellower and what I consider to be ‘rounder’ (talk about an intangible, personal quality… I can’t explain it any other way).
Weasel comes in nifty wooden box. Busman in pretty cloth bag. 
Either of these characteristics may be due to the materials involved (Weasel is rosewood, Busman is pinkivory).
One other whistle that you may see that is similar in look is the Greenwood whistle. I do not know where he got his design specs or ideas from.
His site is www.greenwoodpipes.com
While both makers craft excellent whistles, my Greenwood whistle is similar to my Busman whistles only in the fact that they’re all made of wood (except my Delrin Busman, of course) with brass tuning slides. Otherwise, they’re quite different in size, shape, sound, etc.. In particular, the Greenwood has a much thicker tube and, consequently, is considerably heavier.
Here’s a photo for comparison. Top whistle is my Busman ironwood D; bottom is my Greewood blackwood D.
Cheers,
John