This is probably another stupid question, but since I don't know the answer:
On an 18s case for example, would a case with the lever set position at 2 work for a sidewinder movement with the set lever at 5? (assuming the movement is the right diameter).

As long as the lever is in the same position relative to the stem. Most of the time that's the case with Elgin and Waltham 18s, at least I haven't come across any that didn't. Not sure about all watches makers or models. I do know that not all manufacturers placed the lever in the same place on 16s movements.

[A.] Yes

regards,
bb

Dave, if you put a hunter movement in an open face case, that's what makes it a sidewinder. So, to answer your question, yes it works.

Regards, Krister.

Dave, as a general rule the answer is yes. That applies for 16s cases also, in general. That having been said, a number of watches will not work without altering the lever cut slot and that is particularly true for Hampdens. The other thing that can easily affect things is the depth of the movement. That matters more on 16s cases than 18. Finally a stem may be long or short. As I collect Hampdens I like when possible to use Dueber cases but a case that fits is always good.