I picked up this HST3940 used. It was evident that the previous owner wasn't in the business of caring for his equipment. It had not been stored indoors, and it appeared that whenever they could not figure out how it worked they jury-rigged it.
The first couple of weeks, I spent a lot of time undoing some of the work-rounds (all of the safeties had been over-ridden). Since I have restored many of them, I am truly impressed with how rugged it is. I highly recommend this machine.