I ordered this tool for my specific 2021 road slip, it's for M8 engines, there's 1 other tool I've used, it's similar for twin cam, well you should know how to use it uses tool. stuck, you will need to turn the crank with the socket and ratchet to align the timing marks on the timing chain and turn back and forth until the tool is seated between the timing marks. Please don't try to work if you are not familiar with this tool, it's worth it and it works.