Dear Jim,
It is a popular and understandable misconception that the Linn is a "tweaker's dream". The fact is that once you have settled on a basis (such as the Valhalla, perhaps with the glued rather than spot-welded sub-chassis) then no further alterations are required.
"Setup" means exactly what it says : once the turntable is properly established in your listening room no further action is necessary.
In this regard the LP12 could actually be less troublesome than most others. For example, main bearing lubrication does not require service. It is a once in a lifetime exercise (only in the unlikely event that the previous owner spilled the contents of the Bearing Well in transit!). Many other turntables require you to re-lube every year - which I find a PITA by comparison.
The Linn's mechanical parts are unburstable and will last for as long as you want to keep the turntable.
Although I appreciate the enthusiasm for old Garrards, rim drive never held any appeal for me, perhaps from my tape-enthusiast standpoint ;^)
If you wish to fully experience the depth of feeling for the LP12 you should take a trip over to PFM and you'll get vastly more information there.

