Thanks Cedfire. I thought the whistle was thinner (I'm looking for one about 4mm max thickness, and that looked promising). 8mm is too big for a thing I'm working on.

Unfortunately, none of the stores near me really stock this stuff very well. They have 4 aisles of fishing lures, but maybe a 1/2 an aisle of survival gear, which is usually heavily peppered with camping gear that's dubious in both purpose and quality. <img src="/images/graemlins/smile.gif" alt="" />