I have a Workbee 1510 that I bought about a month ago. It is belt driven. When I am in the middle of a project it ends up slipping And being off ruining the job. Also when I set the zero it is never accurate returning to zero. Can somebody please tell me if there is something I can do to correct this? Or should I convert it to lead screw driven on the x-Axis. If so what exact parts would I need to convert it?