How do you put a clutch on a lawn mower engine?

I do not have too much experience, but on my mower, their is a lever you push to engage the blades. The lever tightens the belt enough that the engine starts to turn the blades. Maybe you could do this on your lawnmower. I do not have too much experience, but on my mower, their is a lever you push to engage the blades. The lever tightens the belt enough that the engine starts to turn the blades. Maybe you could do this on your lawnmower.