Thanks for the feedback John. I may need your help with the wiring into the controller box when I am ready if you don't mind, or is it just a suck it and see strategy? Good comment about Renishaw, I had a probe in my office which we had bought for touching off, at the time I was consulting for BTR Nylex in China and I swear that after my lecture to machine operators about the cost of the thing, it never moved! I used to look at it and try and work out where the cost came from, I can only assume the ruby was mined from some exotic location in outer Mongolia. Have a good one.