The drum is made in two main parts. The drum and one end wall were machined out of a piece of 6061 Al 3" bar and with a wall about 3/8" thick. The other end
wall was machined seperately but is a nice neat fit so less strain will be placed on its securing screws. The end wall are both drilled out for a press fit of the brnze bushes and the 40 tooth 3mm HTD pulley was
machine out to match the diameter of the flange on the bush so that it will be centered accurately when I attach it with screws. The hub on the pulley was removed at the same time.
Still have to drill and tap the end
wall and pulley so I can add the M4 screws that will hold it together. I also have to drill and tap for the M8 screws that will be the teeth.