Some people just never can pin quads. I can do the side of my quad. But not the top. Portion. Heat the oil, and slow injection helps. Keep off when pinning, relax the muscle as much as possible. If it’s virgin muscle, will take a few pins before it stops completely. Or I should say have low pip pain. Take a couple Motrin in the morning, that will take the edge off as well. If it doesn’t work, quads just aren’t for you. There’s plenty of other sites to use.