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Hi
I haven't used one of these so I am just guessing here.
If you screw the adapter into something only one or two turns, then use the lock ring to fix that end in place.
Then screw into the other end, I think that would mean you are using the adapter at maximum length.
On the other hand, if you screw the adapter as far as it will go, then use the lock ring etc, you are now using it at minimum length.
I hope this makes sense.
Philip
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