Good job for persevering Peter!
I did mine a couple of years back...pushed me way outside my comfort zone, and I was astonished to find the mount worked when it put it all back together
I haven't dared touch it since...if there are any enterprising EQ6 experts in the Brisbane area who fancy tuning it, get in touch
Until I upgraded (more recently) to the EQ6wedge too..makes a huge difference to the altitude adjustment during polar alignment.
It's not hard to get RMS error in PHD2 down around 0.4 with good polar alignment, although I've found that's as much dependent on getting a good guide star as anything else.