I bought a 50 recently and just replaced the pully brake pad. The old one was bad and the rivets have dug deep grooves in the clutch drum surface, worse than any of my other Deere's. I'm having a tough time getting the new brake adjusted right ( which I have never found difficult in the past). I can turn the screw in until the pully brake catches but then it seems like the actuating pin is still engaged and the tractor still wants to jerk forward when you pull the clutch lever. It seems like the brake screw needs to be turned out a bit but then the pad doesn't catch enough. There's about half the friction surface gone where the rivets dug in. Could this be my problem?