The best SL-1200/10 set-up video I’ve seen.
I especially like the section on testing for channel imbalance by playing a mono record (such as Nat Birchall's Upright Living LP) and comparing the output meter for any differences between left and right, then untightening the relevant tonearm screws in order to make adjustments.
Update 26/10/25:
This one from Resident Advisor and the Hoppetosse nightclub ain’t bad either (although the Longbox tutorial still edges it).