Getting the perfect seams on coverstitch is what every sewing hobbyist wants, and it starts with getting a high quality machine. You may use the coverstitch machine comparison guide on Crafts Selection to find your ideal match. A standalone or serger-coverstitch machine will be ideal. You may want to choose an 8-thread serger that can be threaded for coverstitch and overlock simultaneously and also opt for an excellent standalone machine, especially if you already have a serger. See here: