Nikon BR-3 where is the canon version?

This is a t-mount for canon fd, is this picture deceiving? It looks like you can mount your fd lens on one side and threaded on the other. This would probabyl work perfect for a thorlabs tube. Anyone care to chime in? Wayne, I searched for FD extension tube, I got results but it looks to come in one piece.

B0002E3WR2.01-A1PY46IM1CBEG3._SS500_SCLZZZZZZZ_V1086704026_.jpg
 
33.

Looks like an easy solution, if the threads will match. T mounts are for telelscopes, perhaps someone here has experience?
 
There's just gotta be an easier solution for and FD mount like the Nikon BR-3. You could go the route, but it would be more expensive, get an EOS extension tube, because they have threads on one end, and then get an EOS to FD mount. Probably set you back 60 or so. Is there a Nikon to FD somewhere floating about?
 
The EOS to FD mount/adapters have a lens in that adjusts the difference in register, and reduces the quality of the FD lenses
 
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