I have been rebuilding my machine and I have noticed that two out of three chain tensioners are missing the "sleeves" that the seals ride on. The front and rear tensioners are missing them, and I know the front needs two, but the rear has one that is held in with a snap ring, and on the other side is just the flange that the sprocket mounts to. Since the rear didn't have one on the side of the sprocket, the flange has been wearing on the tensioner...I know that this isn't right and I could use some info as to where I might be able to find these seal "sleeves"...Thanks!