Craftsman 18.5 42" cut Model 917.276750. My neighbor's mower and won't engage mower belt. Engage lever moves freely. Removed lever and bracket to get better look and it seems something has slipped or either cable is too long connecting engage lever to mower deck. Cable is held in place with wire ties and appears that is the way to adjust slack. Cable end is fixed and looks like it hasn't been tampered with. Would any one perhaps know what length is proper or how to compensate for slack. All looks okay at mower end.