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I have several Canon EOS T-rings that have this screw and all of them fit my Canon 40D as is, that is without the screw being removed.
However, I have noticed that when the T-ring is fully mated with the 40D, there remains a very slight rotational movement, even when the bayonet is “clicked” into place.
Therefore, I had assumed (but haven’t tried it yet) that this grub screw could be adjusted to remove that small amount of rotational movement?
I’ll have a play with mine later and see what it does.
Cheers
Dennis
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