All sailing boats have a kicking-strap to hold the boom down. This is just to stop the boom from going up in the air, thereby ruining the airfoil shape of the
mainsail. On a Fireball we can also use the kicker to bend the mast, thereby flattening the top of the sail. We like to do this when we are sailing upwind on a windy day, largely because we will get
there quicker that way.
Stopping the boom from going up in the air doesn't take too much effort, and any old bits of rope and a 4:1 purchase will do the job.
Don't do this if you plan to sail in windy weather or give a damn about your street cred. We are looking to get something around 16:1 purchase on our Fireball boom, and we're not going to get that by using the conventional multiple blocks side-by-side arrangements. Also discard any notion you might have of using a lever - that's just sooo 1980's. You are clearly a discerning geezer with some taste, and what you want is a CASCADE system.
The two most common arrangements are:
Type 1 - suitable for a kicker which is cleated on a single swivelling jammer in the centre of the boat (usually next to the mainsheet jammer)