Ok so after getting my primary variable speed sheeve rebuilt, i am still having some issues. The VH4D seems to run good, and powers the lift beautifully...however i am having a heck of a time moving around. The machine will not turn without bogging down. I notice that the belt is only engaging with the sheeve fully engaged (closed). The belt is old, and possibly stretched out passed its limits? Anyone have any similar issues in the past?