I did once use a grade 8 bolt instead of a regular bolt or roller pin. It didn't break or shear, but teeth broke on the brass gear. But not only that, the grade 8 bolt distorted or"stretched" the 1/4" hole thru the shaft. The distorted shaft inside the bore or the brass gear made it very difficult to remove the gear from the staft to replace it. I had the drive it off with a hammer and also replace the shaft. Gear unit has too much power and can break pins or other parts when reaches end stops. Recommend position micro switches wired in series with bedroom slide panel switch.
Ellen & Greg
08 National Dolphin DL-35Ci, RoadMaster Rear Sway Bar, Rear Trac Bar, Koni Shocks Front,
Workhorse W22, Kelderman Air Ride, Towing 2016 Smart Car