On 06/08/2020 14:14, Theo wrote:
jon wrote:

How difficult do you think it would be to get an adapter ring 0.25" width,
with 25mm x32 internal thread and 28mm x32 external thread. Well it is
nigh on impossible, although the threads are standard in photographic
equipment. All other combinations of adapter rings with these external/
internal threads are readily available. I am not going to buy a lathe to
make my own, I only need one.

3D print?
Maybe somebody already designed on on thingiverse.com

Theo

Another possibility is to coat both threads in ptfe tape, and then fill
the gap with car body filler.


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