Use the XRP set which consists of 3 Rachet Wheels and 6 Hardwood end caps to assemble an additional set of three rollers.The rollers on the Easy Build and Easy Build Plus frames switch out easily so that you can set your frame up at different lengths. Ideally you can have a set of shorter rollers for when you are working on wallhangings or baby quilts and a set of longer rollers for larger quilts.