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We currently purchase a 500 lbs 3 wheel rope pulley hoist and mount the blocks directly to a 1 inch diameter tube. See attached picture. These are imported from China by our supplier I think.We are looking for a source for the components for these small 3 wheel blocks (or for a similar sized In Line pulley block).Each block uses: (see attached image with ruler (available by email)). 4 - 85mm x 38mm x 1mm(?) steel. (prefer structural aluminum) 3 - 35mm x 6mm sheaves (nylon, black plastic, hard rubbery black material) 6 - 14mm x 7 spacers (nylon, black plastic, hard rubbery black material) 3 - 6mm X 40mm bolts with lock nuts for half 3 - 6mm X 63mm bolts with lock nuts for half 1 - 1mm steel hooks for halfWe only need 100 sets until we get into production, then 1000/month.Thank you,Jim xxxxx pulley block, winch, block and tackle 1 tube tips, pulley blocks(tiny), winch(tiny), swaged tubes, lifting sling