It is a feel thing. Gunsmiths dont seem to use torque wrenches but mortals do.
First make sure the holes and screw threads are clean. Then lubricate with a light oil and wipe off /out as much as possible. This will reduce false binding before the screw is fully set.
I like to do them up holding the short end of the L as mentioned ie not too tight then after 5 or 10 shots go over them again to pick up any that werent fully snug.
Also if you have 4 screws on each ring, tighten then in a diagonal zigzag pattern like you would for wheel nuts.
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