[Dan Richardson]

We ordered two 10 tooth 3/8" inner bore sprockets from mcmaster for ours. Then ran them to a sponsors machine shop and begged them to place a 1/8" broach in them for us. The 6:1 is a pretty good ratio, but if your still worried about weight and lifting power put some serious consideration into using a gas strut, if only one sided arm and correct placement it can keep the arm nearly neutrally bouyant its a great great addition to any arm.