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4) front and rear throws are drilled right through with 5/8" bit. Drilled straight.
5) middle two throws are partially drilled - about 1-1/2" deep, 5/8" bit, AT AN ANGLE.


Interesting that the lightening holes in your 440Source crank are a different diameter than mine. Lots of different designs... (4.250 vs 4.375?) It will be interesting to hear what BG's 4.250 hole diameters are.