the COVER? yah...they're a bit of a pain... the tab is the key, and then, you must insure that the little guide that the cable bends around is all the way seated... it will prevent the screw area from fitting tightly... and THEN, you must make sure the CABLE is correctly seated into that guide to fit the cover down snug... note the thin retainer on the cover that holds the cable in the curved guide... THEN, the screw boss needs to fit EXACTLY onto the threaded hole in the shifter body... snap!

rather annoying , aren't they? try doing carbs on old chainsaws sometime... i termed them "open heart surgery"... and had a huge magifying glass with the bright lights on my bench for those buggers... some had tiny valve/check balls, and springs of different rates holding them in valve ports... and then, there are the flexible, adjustable, fuel pressure compensator arms that MUST be properly set during assembly............. and held in place while you start and snug down the retaining screw that traps the pivot pin on one side only.... and then, those wonderful, leaky old welsh plugs that need dimpled into place after you clean the passages under them..... the new formula gasoline eats the sealant off of them, and then the saw/weed eater/ etc., refuses to run correctly... rebuild times were in the one hour range, and a new carb was between 15 and 40 bucks, so........ yah, we REPLACED the carbs.... if they were available! The customers always complained when we didn't "just rebuild" their carbs.... that shop's repair labor rate was $75 an hour, then... higher now!......... sigh...

oh, and i'm an old Bass guitar player, so my finger tips are calloused like leather gloves........