Dear Sylvain (and those interested)
I have already indicated that I will support you by accepting one of your aluminium anodised M44 Q.C.Adapters. This arrangement will only change if you can provide a S.S. version from your same supplier.
Please note, I have not physically seen an original Carl Zeiss Jena Adapter, the one you possess (with the reddish coloured acetal type cover disc within the thumbscrew) belongs to the latter generation of Telementor/Telemator instruments. I have also never seen the Zeiss engineering specification for the same. Even 30 plus years ago such technical information would have ben very hard to extract from either Zeiss (East or West).
The point I'am making is that we can never truly copy something from the past, we can however maintain the principle of always trying to improve upon something in the light of experience and modern production techniques, this was surely the way which led to the international reputation of Zeiss.
So far, you have not indicated what your original adapter is made of. People can only guess other issues from your photographs on this forum.
As a humble civil engineer , with over 40 years using Zeiss equipment, and an equal length of time with astronomy as an interest, I would stipulate the following before accepting a S.S. adapter.
1. Grade 316L stainless-steel ( or 316 if pushed) , 304 or anything is not acceptable. 316L, briefly, has very high anti-corrosive properties.
2. No anodised or any other coatings to be applied to the adapter. Surface finish should be smooth, finely tooled and very smooth to the touch, Please note, a mirror finish is not required, but the unit should look smart and free from tooling blemishes.
3. The interface where the adapter plates meet should be flush and light-tight and threads either side should be undercut to ensure an interference style fit where they meet the scope and whatever fitting on the other side.
If the S.S, adapter is made in accordance with the above it will last a lifetime.
And I will pay the appropriate price ( within reason) to the maker, subject to his/her firm confirming the above.
It won't be Zeiss but it will follow in the tradition.