hi im on the verge of buying a mk1 clipper,but the cam belt snapped and i think the engine may be stuffed as i cant turn the head with the cam belt off or shouldnt i be able to anyway,or is that a sign of seizing? im considering just buying a second hand engine,but want one that would just go staight in without any additional agro,so any suggedtions,advice greatly recieved ,thanks very much