I always just put a tiny drop of superglue on the top of the shaft, and then
press the turntable back on, having first determined what the correct height
setting is, as the turntable tends to grip to the shaft very quickly ...
Don't overdo it on the glue though, as you don't want to press any down the
shaft and into the top bearing :-\
Arfa
I tend to find superglue is some sort of super-fluid , almost totally
lacking in viscosity and migrates along interference fits rather too easily.
As occuring in a laptop drive, the bearing would be only just below the
platter.
But can't you buy gel?
You can, yes, but the stuff I use comes on a card of like 12 tubes from the
local supermarket, and costs a coupla quid ($3). It works better than all of
the named brands, and is reasonably gloopy, whilst still being a good
liquid - if you see what I mean ...
To be honest, to be on the safe side, whenever I am glueing anything close
to a moving part such as a motor bearing, I tend to put a small amount of
oil or grease as appropriate into it. Then, if any superglue does find its
way by migration or spillage, it doesn't actually stick to what it
shouldn't.
Arfa
Or just hang it opposite of the pull of gravity while the glue dries :)