[rayhines]

Yeah the hole does not line up well, you cant really see the adjustment wheel. But if you use a bent small screwdriver you can do it by feel - not easy.
I took off rotor, and worked out (by putting rotor back in reverse) where to drill a hole for adjustment with the rotor on.
It is not hard to drill a 10mm hole in the rotor (in area clear of holes) using a good quality high speed steel drill. Go 14mm if you have one.

Dean it only holds in park as the handbrake is not doing anything, it's the park lock pin working.