so this is how I handle drive belt teninosers. and I do this every time I got one on the bench. A . place in vice, b. pb blaster. c turn vice handle to compress spring, note vice grip handy to keep it secure., sometimes you got to tap with hammer to get it to move. open and close a few times. wipe with never seize, {you are going to see the pivot pin work thru the the half moon] if its got divots or brgs have excessive play . suck it up and replace it . trick . most of the time they wont cam over from starting point. so when installed its a bitch. remedy is to preload while in vice cut the end off a zip strip, and place between pin and start point giving a slight pre load. install it put belt on if new belt ? bottom out teninsoer. 3 oclock plus. may have to apply down pressure and tap big gold cover with hammer to get it to cam over. LOCK IT DOWN DEAD head AGAINST BRAKE> belt is now stretched and should be in happy place