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Hmm, just tried 3 of my T-rings for the canon 40D:
#1: Canon EOS-Made in Japan.
#2: Canon EOS-Made in Taiwan.
#3: Canon EOS–no other details.
The only one with a small grub screw was #1, Made in Japan.
#2 & #3 did not have a grub screw.
#3 was the best fit; that is, it had the least amount of axial rotation once “clicked” into place.
I tried screwing the grub screw in and out on #1 and this did not remove any of the axial rotation but looking at the design, this was not surprising.
Cheers
Dennis
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