Kapex calibration: what is this screw?

[johnbro]

My Kapex is out of square by .37mm over 265 mm or for us 'Mericans that's about 15 thousands over a little over 10 inches. This sounds pretty good but my Kreg miter square tested on the same piece of wood (using my PM 66 TS) is precisely square (zero variance front to back over the same 265 mm).

So I'd like to adjust it per the Supplemental Manual, but I can't find a bit that matches the screws you have to loosen. They look like star bits but none of my star bits fit the screws.

Anyone know what I need to get to loosen these screws?

Thanks!

 

[Frank-Jan]

Torx 20 will work, or a flat screwdriver of the right size. (The T20 feels a bit sloppy, but the t25 is too big, maybe the sloppyness is caused by the slot for the flat screwdriver)

 

[johnbro]

Thanks, that worked famously. And now according to the calculation in the manual, my error is only .0066, whatever the heck that is