HiFi dave, I'm typed out - help please...
Right, assuming the deck hasn't as yet been knurdled, remove the outer platter, headshell and counterweight. use a twist tie to anchor the arm on its rest.
UNPLUG FROM THE MAINS!!!
Tilt the deck up and undo the four screwed feet, removing the flimsy base board, which could do with enforcing or replacing.
See if the inner platter is held in by a metal clip, which doubles as an earth point for the sub-chassis. Undo the screw (posidrive no:0), remove the metal clip and replace the screw and earth wire. You can then put the deck level and remove the inner platter once the belt is also removed.
Check the spindle. If it's around 10mm diameter and you can see two bronze bushes in the bearing well, I'd suggest some EP90 gearbox oil, part fill it like an LP12 - too much and you'll have an unholy mess once the spindle is put back - been there and done it loads of times - keep plenty of kitchen towel handy.. If you have a later, mid seventies spindle - around 7mm and with a deep bronze bushing - then a good few drops of the slightly thinner EP80 (as used by Rega) will be fine. By the late seventies, the spindle had reverted back to before, but with tighter tolerances as I remember.
Will this do for tonight? I wrote an article on 160 setup for HiFi Answers many centuries ago and got paid for it too. I don't know if I have the mag somewhere, but Hifi dave (fount of all old publications) may have it somewhere...
Looking underneath again, see if yours has the transit screws either side of the sub-chassis. These are mounted on the plinth and there used to be a couple of black felt "cushions" stuck to the wood, which always used to lift and foul the sub-chassis. these felt strips can be safely removed.
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me