you can put a dial indicator on the outer sheave of the primary BUT that wont tell you a whole lot. the entire driven clutch rests on the shaft, which is sitting bottomed out in the bearing that is in the outer fixed sheave. i have seen these bearings be outta whack and allow the entire driven clutch to wobble around even though the shaft is straight. SOOO... putting a dial indicator on the clutch may scare you because they can easily get outta whack. you could have a bent transmission shaft making the entire clutch wobble, or your outer bearing that is pressed into the outer fixed sheave may not be bottomed out properly which is allowing the clutch to wobble around un-necessarily.
if your dealer did not replace the back of the secondary then he screwed you! when the secondary comes off from the bolt backing out, it chews up the helix and chews the ears off the helix. once the helix is chewed up it chews the back of the secondary up as well. i have fixed dozens of machines after the secondary bolt backs out and every single one has needed 4 or 5 things
1 - cam (helix)
1 - inner movable sheave
1 - new bolt
1 - 10mmx1.5 tap to clean up the trans shaft. when the bolt backs out the spring tension is so great that as the bolt is backing out, when the bolt gets to the last thread, it almost always rips the last thread out of the trans shaft. the secondary bolt is so much harder, it does not hurt the bolt, it rips the last solid thread out of the trans shaft. so i always take a tap and clean the shaft up.
1 - secondary spring depending on the conditions. most of the time as the secondary is spinning and comes off, the secondary forces the spring to spin violently and melt itself into the helix. you would likterally have to chisel the spring out of the melted helix in order to re-use it. if you had a torsional spring then it unwinds the torsional spring rendering it useless.
you likely would need the spring as well. i have always replaced them because its easier to replace a $15 spring than try to chisel it out of the melted helix and "hope" the secondary spring is still good.