Luke11CNC Build Log ,I'm so naïve

[Jonathan]

take it down to my local engineering shop and have it rematched

Rematched? Wont they charge a lot :(

if it doesn't work I will have to buy a new one but I'm not going to cut corners to make it work now

I'll buy the old one if it is spare, then you don't loose out. Just need to get ball-nuts for it and that's my milling machine X and Y sorted. I need to do the end machining myself for that anyway.

and if it works they can do the other one (z-axis) as that is the same

What is the overall length of the Z-axis screw?