I have the Saitek yoke with throttles. I decided to guy two more throttle quadrants. The problem is the two new ones have way less friction than the one that came with the yoke. I was wondering if there is a way to adjust the friction of the new quadrants to match the original one.

I opened the thingies, I don't see how that would be possible. You could try adding some fat inside to put more friction but not sure if that would work as expected.