How do you level your turntable?

I really think that a quality TT really needs to be leveled to the point of absolute perfection. I would agree that owners of linear trackers need to pay more attention. I think your problem is your table and where it sits.

Lindisfrane, nope, turntable sounds fine :O) I have a new protractor and just thought I'd try for a "best of my ability" setup. I'm sure some of us are pretty anal about leveling and thought I'd tap in.

Schipo, My table is set up on a spiked, heavy wooden audio stand with granite inlay. Unfortunately using a pier and beam floor, but I'm not ready for a wall mount yet.

I use a bubble level to good effect.
I've got a marble slab on top of an inflatable tube. But...
I level the stand first.
Then I put the table on top of the bladder / slab combo.
Then I put the bubble level on the bare platter. I put it at several places along the arc of the tonearm, where the cartridge would read
Then I move the air bladder under the slab a little bit at a time until the bubble level reads level. The slab isn't necessarly level, and the plinth isn't necessarily level. But the platter is.
Every couple of months I add more air and repeat the last step.
Thats just me though.

An excellent bubble level on this site: (http://www.analogueseduction.net/acatalog/index.html?http%3A//www.analogueseduction.net/acatalog/_Turntable_Setup_Tools.html&CatalogBody) Proper leveling(of the platter) is absolutely essential for good reproduction via vinyl.

Bubble level from hardware store - $3.79.