LOL would you believe it, just as I think "yep, I'll go with the dual motor setup on the X-Axis" Sod's law kicks in and the PM752's are not easily available (ebay from China only), but there are comparable digital drivers available and my guess is I'll have to switch out the Z Axis driver to be the 2nd X Axis and run the new driver in its place. That's assuming MACH3 has no problem with a mix of drivers (provided they are tuned to the same steps per rev etc.?)