I have a older Craftsman LT4000 riding lawnmower. I took of the mower deck to replace the belt. Some how, the Clutch spring came off (I didn't notice until I put deck mower back in place). So now I have a clutch spring (3 inches long) I need to put back on. HOwever, I don't know where it goes on the mower deck. The blades do not disengage and stay running all the time. Help