These hookarms can be mounted in a machine frame of your construction. The headstock should be 3/4" to 1 1/8" thick. The handle plate should be a nominal 3/4" thick. The hookarms should be laid out with a triangular mounting pattern for three strands, a square for four strands, and a hexagon for six strand machines for best operational performance. The hookarms need to be positioned (shaft center to center) at least 3.25 inches apart to prevent interference with an adjacent hookarm.
The arm in aluminum is part number MH1.
The yellow brass version is part number MH2.
The design of the headstock and handle plate needs to have matching joint lines, so the joints can be separated for insertion of the hookarm after the headstock and handle plate are coated with whatever finish the builder desires. Then, the two need to be clamped or screwed together so matching holes can be drilled for the hookarms. Be sure to mark the handle plate for “top” and “handle side.” The actual hole positions can tolerate being 1/32” off the targeted placement without upsetting the operational capability of the rope machine.
The hookarm's shaft diameter is 0.385" nominal diameter, as cast. Plan to drill holes in the headstock and handle plates at 13/32". Use a sacrificial backing board when drilling to prevent headstock tearing out on the backside.
Alternatively, file or sand the hookarm shafts down below 3/8" diameter to use a standard 3/8" drill hole. This version of the hookarm can be retrofitted to an existing Meyer machine if the round shafting parts are filed down to the diameter of the original part.