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All newly drilled lens mounting holes should be beveled prior to assembly. Three or Four turns by hand removes bur and puts a smooth 45° bevel on drilled lens mounting holes. Simple way to file rough edges around the holes in drilled rimless glasses.
Reduces the risk of lens cracking or crazing
Remove burrs or rough spots on the len
Reduces the risk of lens cracking or crazing
Remove burrs or rough spots on the len