My cutter was old and decrepit when I got it. I turned it up on it's side, balanced the blades, cut the rest of the rotten stump jumper plate off, and replaced the bolts holding the transmission to the housing. It has run Like a new one for 10 years. I just have to make sure I don't drive directly over a stump. My habit has been to yank the PTO lever when I was done cutting and drive back to the barn. A couple weeks ago a cutter blade hung a root coming up the trail. I didn't think much of it until I went to use it this weekend and it only made about 1/4 turn and locked up. One blade was stuck down in the dirt.
I ordered a new stump jumper and blades for a little over $200, so at least this lesson wasn't as expensive as some have been. From now on, leave the blades spinning until I'm outta the woods.