... like for Worm Gear Boxes (most of the makes) of C.D. 50, 60, 75, 85, 100 mm, Ratio 30:1 ... like for Worm Gear Boxes (most of the makes) of C.D. 50, 60, 75, 85, 100 mm, Ratio 30:1 ... and Rebuilding Services Worm Shaft and Worm Gears, Spur, Helical, Double Helical, Internal Helical and Internal Spur Gears and Pinions