Your Pittsburgh jack is not very stable because it uses a 4-bar linkage system, and a cheap one at that, to lift your bike. There are basically just too many low-quality joints that allow for movement. If you want it to feel solid, get one of these jacks and then also buy a RE-FJ JACK. You could also just use 2 x RE-FJ jacks. Poh-tay-toh Poh-tah-toh. Lift the bike at first with the DMCS-1000, and then raise the other end with the RE-FJ. It’ll be far more stable. Thanks for your question!