... frame, spool box, hand wheel, spindle, bevel gear, lead screw, nut, nut shelf, bearing box, cross beam, push-off ... be properly placed and clamped.2.2.3 Lead heads and push-off tubes are used for ... followings:3.1 If there is clearance between the lead head and the candle mould cavity, expanding the ... hand wheel, through movement of the bevel gear, lead screw, nut and nut shelf, move the cross rail and ...