TownsendsFJR1300For the op, the machine is made by MDT: https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/cub-cadet/craftsman/41-handheld-products/gas-chainsaws/cmxgsamy421s-41ay421s793/general-assembly The parts diagram doesn't show the adjuster. Can you post a pic?
riponhello buddy, I also faced the same problem a few days ago. then I read some blog on it then got the answer. talked about it in their blog. you can take a look on there.