Doug,The propdrive on mine has a groove turned in it. I managed to drill it by holding it in the benchdrill vice, and used a drill size same as magnet minus a couple of thou: pressed the magnet in to just below the surface of the propdriver and then filled the groove in with car body filler then smooth it down, theres no way it's going to come out, {mine hasn't} Brian,Im using 2 stroke oil, at 20 to 1, and there,s a slight residue out of the exhaust, so oil must be getting round. It's run for about an hour {on and off } up to now and nothings happened yet!!