Would it be possible to make a hardened 5/8 shaft? I have problems with swelling and bending of the shaft. mainly due to jamming of parts like the chain binding in the engine case. (problem should be solved with the left side tensioner) Also both the left and right side chain tensioners came with some wrong size nuts for the bolts. I'll get the right ones Just fyi. also you may consider a extra hole in the left side chain tensioner or to make the tensioner bar shorter to better center the tensioner wheel on the chain. with the half link I could not find a way to tension the chain without the 21T gear and the tensioner idler wheel touching. possibly the tensioner is not meant for the 21T? but designed for the 17T? I am gearing my bike down for off road only.