Most American made and many foreign made guns have slightly tapered dovetails.
The "standard" is drive a sight out from left to right, and in from right to left (as you'd sight down the barrel).
The "trick" is to get the gun in a good, well braced no bounce-no move setup.
Use wood blocks or whatever needed to brace it. If, when you hit it the gun moves around, the force is dissipated and the pin or sight won't move.
Use a brass or hard nylon drift and a small steel or brass hammer.
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