I had read about the air gap thing after the fact. I will call the repair shop and ask them just in case though. I don't think it was adjustable.
Here are some photos:
I was mowing today with my John Deere STX38 and all of a sudden the blades stopped spinning. I found a wire un-attached going to what I think is the PTO clutch. It was crimped it, so with no way to uncrimp it I stripped it and then super glued it in. (Yeah, I know, I just wanted to see if it...