X carriage had play, cant get offset nuts tight enough for the bearing to seat snug int the extrusion groove
Fitting the carriage is a bit of a mission, you can remove the extrusion and slide it on.
I fitted first the two back bearings, then while holding the bearings in the extrusion groove
fitted the front bearings
I do recommencement to remove the bridge rather
I did battle to fit the limit switch, i had to drill the holes a bit bigger