Dlandbob, Please go back into your original post and edit it to include the reason (in detail) of why you tore apart the primary.
It's also helpful to include what correct model & year dog you own in your "My Bike:" information on the left side of screen.
You mentioned "clunk". Is this while sitting idleing, starting out, slowing down with clutch engaged, downshifting, upshifting, coasting, need the info. Does the trans shift okay without any noticable difference.
While you were moving the clutch pack around with both hands (not rotating it) side to side, I though I could see some trans mainshaft movement. Could have been a video thing.
If you do decide to adjust the primary chain, you will find that sometimes the adjustment notches for the wear pad bracket teeth don't always want to mesh together at the best chain tension. If this happens adjust it to the next looser tooth engagement position. Better to leave it a bit loose than too tight and not stress the clutch basket and bearings.
IMO.. I don't recommend decelleration downshifting. I feel this contributes to loosening the clutch nut and other related failures. I downshift with the clutch disengaged just before I roll to a stop. It's not as manly but It's how I treat my dog. ... IMO