It's not really a can of worms, it's a no-brainer, I had an LP12 for 22 years, did everything possible to it in that time including a carbon fibre subchassis, PSU upgrades, 4-5 different arms of ever-increasing sophistication (and cost), everything bar the Circus bearing upgrade which I didn't like.
IN the end I got fed up with this, sold it and swapped it for a Rock Reference which cost around what I sold the specced up Linn for. Night and day and wish I'd done it years ago. Later had a Garrard which with a good 12in arm in a high mass plinth was even better.
The LP12 is a decent TT up to a point, but to better it is not difficult or even that expensive.