Okay, I'll try to take a photo. Nice looking machine, but plagued with lots of silly problems. I am beginning to think the plastic pulley (jockey wheel) is the cause of the problem. Plastic tends to distort easily under pressure, and plastic moving against metal parts is always a bad idea. I wonder if I could replace it with an alloy pulley of similar dimensions?

One thing to note, the mower I bought was evidently released as a small run and quickly replaced by the 767KSP. This makes me wonder if it was in some ways "experimental" and the problems were ironed out with the later models? I guess the only good point about this is it possibly makes the 757 a rare model.