SummaryAfter creating a similar tensioner for HTD 3M I needed a tensioner for another system with XL belts. So I took the job done by John Newman in his Y-belt retainer/tensioner and used his belt design.InstructionsI guess it may work with T5 belts too, as they differ very little in dimensions. Though it has a nut trap that will comfortably hold an M3 or force fit an M4 nut, you will not need a nut if you use an M4 bolt for threading the hole. Slide the belt from the side matching the channel indentations. It may take some effort and time to get it in.