the base pressure is set by, turning the adjusting screws in the pressure plate with allen wrench.we have a hole cut in back of bellhousing for this . we use a long allen wrench to reach in and adjust clutch. you can turn it 1/4 , 1/2 3/4 or full turn to raise or lower pressure. no shims are required. we use a speedhandle, rotate to hands on a clock, 3 clock, 6 clock 9 clock or 12 clock, very easy and simple!!! on the mopar trans, the upper right side bolt hole lines up to adjuster. you do have to index the balancer to find the spot. on jerico, had to drill a hole, 1" in back of housing. it's not complicated. BTW, you use a aluminum flywheel, it disapates heat out if the clutch.