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I've seen instructions from sight manufacturers suggesting removing material from the bottom, and also from the sides. I've done both in different applications when installing dovetail sights or dovetail filler blanks. The key with either method is to go slow, keep testing the fit, so you don't remove too much. I generally remove material slowly with a small triangular file (if removing from the sides) or with a stone/fine file on the base, taking measurements with calipers periodically during the process to determine how much needs to be removed, and also trial fitting.
I stop removing material when the sight will slide in the dovetail slot by hand (without force) about half way, from the right side to left when sliding it in. Once the sight being fitted will slide in about half way, I tap it the remainder with a plastic or brass drift and small hammer.
If your sight plate has a set screw to secure to the dovetail, I would ask the manufacturer of this optic mount how they recommend fitting it (assuming there were no instructions provided).
I stop removing material when the sight will slide in the dovetail slot by hand (without force) about half way, from the right side to left when sliding it in. Once the sight being fitted will slide in about half way, I tap it the remainder with a plastic or brass drift and small hammer.
If your sight plate has a set screw to secure to the dovetail, I would ask the manufacturer of this optic mount how they recommend fitting it (assuming there were no instructions provided).