Kinda silent here; thought I'd post a question. I normally bug Pete with a million questions; so I thought I'd give him a break and ask it here:
On a Shenkl percussion fuze (brass, Pat. D. 1861) you find 9 or 10 threads. They are obvious, big, and easy to see. But, below the big threads, down the "shaft" which looks to be a smooth brass surface, there appears to be very fine, hair-line threads. I have seen the same thing on some Hotchkiss fuzes. Can anyone tell me what the use was for such a finely threaded shaft? They seem so miniscule, and so finely cut as to serve no purpose. However, I know that can't be the case.
Thoughts appreciated.
Thanks