Quote:
Originally Posted by Gregg
What size screws will you be using? The normal screw size is an M3x.05. That is the best overall size to use. The tap you would need is for that screw and it takes a 1/8th clearancing bit . What size are the holes in the rails? You will need to tap them according to the hole sizes you currently have. You will destroy the screws and rails if you just try to ram home screws in the current holes.
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1/8 is gonna be too big for a 3mm tap. Need to use 3/32 with some tapping fluid for the alumunium. Stops it from gumming the bits up.