NEW DESIGN ---The newly re-designed for 2020 Hot Rod Sled Shop Clutch alignment tool for 2008-17 Ski-doo XP, XS, XM, & 2017-2021 Ski-doo REV GEN4 850 Chassis sleds with TRA or PDrive primary and QRS Secondary clutch. The new tool now clears the cooling fins on all the REV GEN4 sleds. This tool is designed to achieve the best offset we have found for lowest clutch sheave temperatures and proper jackshaft alignment. We also have a machined section to clear the fins that Ski-doo added to the QRS secondary in 2019 as well. Most of these sleds need our QRS shim kit to align them properly. The QRS shim kit is available for purchase separately. We also CNC engraved : Center to center, Z, X, and "Square" (Y-X) measurements on this tool. Made of Aircraft grade aluminum for a lifetime of service. Buy a QRS shim kit and this tool and you will have a better aligned clutch system and a happy belt.