I would think the embroidery arm needs to be calibrated....If the problem with the machine wasn't fixed I would have returned the machine for further service and not have to pay more for it. If he's an authorized service repair tech...He should know what to do. if he cannot fix it he should have told you or send it to someone that can do the service required to get the designs the way they should be. If all else fails Call the Singer company and have them tell you where to bring the machine in for repair...