Thanks Jazz,

I did not realise as I am doing most of my debugging and research on my laptop which has no motion output etc - just a laptop and Mach3 etc. I tried 'jogging' when in tool change but it did not move so assumed it was fixed for some reason, probably just did not move as it has no motion attached. :)

I will find out this weekend what my parallel is like, I would never guess it would be perfect though, so shims is the way I would choose too.

On the bridgeport i've used many odd ways including cutting a pocket into scrap aluminium, bits of plastic, wood, basically anything goes that will hold it down. Most of what I'm planning will be 5mm Alu sheet or thinner so pretty easy to mount, DS tape would likely work if i degrease the faces.

Just trying to amass as much info as i can before I go throwing metal and cutters at it :)