Hey Frank - thanks for the time but I got one from Dave for the 1st No. 20 I fixed up. While it is surely better than no bayonet whistle but I'll wait (a long time) for a donor to pop up. Interestedly, just this past weekend I pointed to someone to Dave for one of his repro bayonet whistle and they ordered one!
BTW, what do you think about that grooved balance wheel - seem many of those on Weedens?