take off the wheel, tap a knife down the side of dust cover and ease out.undo the hub nut 32mm,tap the brake drum and it should come off. undo the brake pipe nut and the two 6 mm screws that hold it on [ are torz if original].you may need self grips if very rusty use 6mm with 10 heads to replace them Sometimes the drum takes a lot of getting off clean the shaft with fine sand paper then wd 40 it to make it easy next time
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