It seems that one of my older lights uses a 17mm tailcap boot. These seem to be a bit of an oddity. 16mm just does not fit right and I do not think would pass a rain storm.
KD has a black one, but I am really after green or blue. Does anyone have 1 or 2 of these to spare?
"KD 17mm":http://www.kaidomain.com/product/details.S022046
Thanks Matt