Spacers for Rega P3

Loosen your arm's lock nut and slide some playing cards beneath the arm base, one at a time, until you get the height you want. Then measure the thickness of the cards. (If you have a feeler gauge, use that instead of cards of course.)

As for what height to choose, we can't tell you even after learning the model of your cartridge because there are too many variables (record thickness, mat thickness, cartridge suspension wear, etc.). What matters is how the music sounds at various arm heights, and no one can tell that but you.

The VTAF mentioned by Sounds_real_audio would give you flexibility to adjust for different LP's, or different cartridges for that matter.

OTOH, if you just want a set-and-forget height, choose a typical thickness LP and make the armtube level. That's close enough for those not inclined to tweak for optimum sonics.

Doug

P.S. Whatever height you end up at, don't forget to recheck your tracking force. Changing arm height on a Rega alters the VTF slightly.

Thanks for the Thorough reply.
Will do as you suggested.

By the way, How tight should screws 1 & 2 in this picture be closed.
http://picasaweb.google.com/100352153551466589742/UntitledAlbum#5500866265439975474
I recently installed the Isokinetic cardas rewire kit (excellent upgrade) and had to mess with them. I ended up closing them in a way that allows me to adjust counter weight but use a bit of force in order to do it. I mean...is there a torque figure for that ?

Doug,

The result of your card test is 2mm.
The mid sounds much better now. Could 2 mm have such an effect ?
I'll order a 2mm spacer.

The mid sounds much better now. Could 2 mm have such an effect ?

Apparently! Why doubt the evidence of your own ears?

Technically, if you think of it from the perspective of microscopic stylus riding inside a microscopic groove, an arm change of 2mm is pretty massive.