They're called "easy-outs" or "E-Z Outs" and these are the smallest I can find at 3mm.
McMaster-Carr has these left-hand twist drills. They become their own easy-out.
Also, is the broken/corroded screw down INSIDE a recess, a tube in the case? If it is, then just sawing a slot in it to take a flat-blade screwdriver becomes a lot less of an option. So instead of cutting a groove which will ruin the case, or drilling any at all, easy-out or left-hand bit or anything, FIND SOME THIN-WALL TUBING (Brass is probably going to be your best bet in this small size.) the outside diameter of which -just- barely fits inside that hole in the plastic case. It should go without saying that the inside diameter has to be just a touch LARGER than your drill bit....
You only need a stub, a piece of the tubing just a millimeter, two mm at most, longer than the recess hole is deep. Drop that short length of tubing inside the hole, to LINE IT and protect it from being chewed up by the drill, and ALSO to GUIDE ANY DRILL STRAIGHT ONTO THE HEAD OF THE SCREW, with no sideways angle at all.
Using a piece of tubing like this keeps the bit from skating side-wise into the plastic, coming out who knows where inside on the motherboard or inside the hard disk bubble or something.
Any of this making sense yet? |
