When faced with that problem I don't do anything to the dovetail slot, I use the punch on the sight slider itself.
Open the jaws of your bench vice just wide enough to support the upside down slider. Put a thin piece of leather or lead in the vice to protect the sight, then take either a flat nose punch or a prick punch and stake the front and back edges of the slider.
Be gentle, and keep test fitting to where you get the tension that you want.
Replacing a sight slider is a lot easier than replacing the barrel, or cutting a new dovetail because you punched too hard and rolled the edge.
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Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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