Stop in for a cup of coffee

The only thing I don't like is my mower keeps throwing the belt off the crank pulley when you disengage the blades.

So everytime I go to start it I have to put my hand in there and put the belt over the pulley or it won't engage. I do this before I start it because one time I got scared after I kicked the belt over turning pulley with the engine idling. Prolly not very smart.