Well, that works much better :0)
View attachment 57355
View attachment 57356
The combination of thinner rubber band and the filter holder being tighter to the front of the lens makes it completely stable. I've been rotating the lenses left and right continually and the band hasn't slipped and the adaptor hasn't unclipped so all good.
I'm going to tidy up the adaptors and spray them black then I'd appreciate it if someone with a Bay1 TLR could test them out? I'm happy to cover postage in return for some feedback. I'll send them with dual cpl filters as well as the 9 stop variable ND for long exposures. Of course, any 37mm filters you've already can also be used.
Cheers
Steve