I thought I might share a tip to cure your “chewing” and maybe provide some relief to those of you who can’t stand the taste of metal whistle tips?
Rubber “Tobacco Pipe Tips”
http://www.ioffer.com/i/36493426?store=1
Pipe Tips slide easily on any tin whistle tip and I like the extra control I have with them to hold my whistles. “Softy” brand Tips, and others, can be found at most tobacco specialty shops and, of course, online. Try them!!!