I designed a center jack to fill a need to raise the front of a bike while on the lift. I talked to my fabricator buddy and we hatched a plan. Luckily i went on the internet and found the Bikemaster center jack at 2wheel. 2 days later my bike was air borne. No muss no fuss. Built better than what i had conceived. Adjustable to fit various frame dimensions. The wrench that comes with it is a little crude so i use a socket and ratchet. Works well for my application.