If you hold your Luger in preparation to fire it, you would place the tape approx. midway between the serial numbers on the rear toggle link, and the lanyard loop. If you look closely, you will see marks made by the rear toggle link as it strikes the rear of the frame in full recoil.
Place an empty mag in your Luger and cycle the toggle train to lock the toggle train as if having fired the last cartridge. You will see the portion of the rear toggle link that contains the rear sight come in contact(or nearly so) with the rear frame. It is this area where one places the tape to determine how hard/soft the rear toggle link is striking the rear frame area.
Does any of this make sense to you?
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