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Take things slow, as a retired gunsmith I always advise against small hand held power tools for such operations. Possibly a nail file is an acceptable tool to use, but please use it by hand and go slow, checking your work as you go.
Yes, that is good advice, I probably would have ruined the eye piece using the powered drill.
I don't have any needle files.. I'll have to go to my brothers.. Did you file the eyepiece or the rubber part? Sorry to keep bugging you. I appreciate your help.