Here is a way to check your angle on your drill bits. Take to nuts American made and stick them together and you have 118 degrees I keep them in my tool box for refrence. My nuts happen to be 5/8" Dia. size just lay them flat and tack them together works great.
62Blue
Don

62Blue
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You've never been lost until you've been lost at Mach3" Paul F Crichmore (Test Pilot)