has anyone rebuilt one of the hc5370-71 sidemount rams from seastar? im in the middle of the build, but something is not making any sense to me. it looks like the shaft seal goes on the inside of the cylinder on the ram itself, on the motor side of the brass fitting that keeps everything centered, but should that brass collar and the o-ring shaft seal float on thet shaft like mine are, or should they be locked into place to maintain a seal, which makes sense. and if they are how does one accomplish that. thanks