AFAIK the only adjustment is with the shims that set the air gap. If your problem is a weak coil not being able to generate the necessary magnetism to engage the clutch, then removing shims to reduce the air gap might help the clutch engage... or it might do nothing.
TBH, if you're going as far as to get the pulley/clutch assembly off the compressor (which is what you'd have to do to fool with the shims), you might as well replace it with a brand-new one. JeepAir sells complete new assemblies - that's clutch, coil, pulley, bearing, shims and bolt - for $80. I'm going to be doing mine in the next few months.