If it's the Bizarre and not the Hyper (2 differnt machines) Bizarre uses an eccentric cam and the Hyper is a swash type The stroke length on the Bizarre is changed by changing the cam, the machine normally comes with three, short medium and long 1 ,2 or 3 indent dots on the cams IIRC never heard of a Bizarre v3 tho Post a pic of your new toy so we can tell which one you have