Hi I have a Harrison m500 which has just took 4 teeth of a gear at the bottom of the spindle gearbox which drives onto the gear ring on the spindle it's a 52 tooth gear. Does anyone know of any for breaking or anyone who would have the parts, I can buy new but have to buy all 3 gears and the shaft I think the 400, 450 and 550 may be the same any help is appreciated thank.