I got my hands on the elusive (for me at least) Loop24 optical rotary stick as used on Caliber .50. Just a note that it has detents. It has 24 positions instead of the 12 the LS-30s have. It uses a 24 notch disc on the bottom and each click passes one notch past the optical sensors.
Thought I'd mention it as it was said that it didn't click in
this thread.
Edit: Sorry this is redundant, I should have done a search before posting.