Linn LP12......That good??

Rossb, you are discounting a lot of things...a) the set-up tech was competent,( remember a lot of the old school techs had never set up a Radikal before, this power supply and motor change is a very different animal to just swapping in a Lingo!) b) you were able to correctly place and level the table once the set up was completed, which is one of the issues that many Linn owners have after they take the table back from the set up tech, c) whoever installed the Radikal knew what they were doing...perhaps it was a different tech who installed the Radikal to the set up tech....or perhaps it was you!
I can absolutely tell you with complete certainty, IF you had a problem with speed stability with a Radikal, then you or someone else had set up the upgrade in a faulty manner. Period.
Blame the company or the table design or whatever, but be absolutely certain you never heard your Linn Radikal the way it was meant to be heard ( and does sound!!!) ... or for that matter what you paid for,i don’t blame you for being upset....but you really have no idea as to why you did not get what you paid for, imho.

...once set up properly...adjusted accurately, how do you get it home?

I had a single speed 80s vintage LP12 with a Grace tonearm, Sumiko cartridge, and Mitch Cotter cabling. A decent Linn rig. I went to my Linn guy once for suspension readjustment. Sadly, the table never had the oomph and vaunted sound quality I'd hope it would have based on everything I'd read.  I gave up on vinyl (again) for a time until I bought the VPI Player. The VPI leaves the Linn in the dust on all fronts. I think I, and many others, have fallen for the LP12 hype and then have had the reality crash down on us.  

Audio video nirvana, sorry but your LP12 was anything but a decent "Linn rig". The Grace tonearm was nothing special at all, imo. (Never mind the Cotter cabling, lol)Perhaps it was ok back in the 80's, but even then Linn had the Ittok, which IMO was a far far better arm. Are you sure that you want to lump all LP12's with the " decent Linn rig" that you had back in the 80's!!

A "real Linn" purchased new costs upwards of $10K+. I’ll pass. There is better value to be had for that amount of money than even a new Linn. All I know is that my current analog front end sounds great and does not have the blah sound I suffered with for the seven years I had the LP12. Even after "fixing" it at a Linn dealer it was blah. I’m very happy with my VPI. If I ever have the cash to improve my rig it’ll be a VPI, no doubt.