Gandy stresses mechanical ridgidity over all else. They feel that Installing a shim or variable VTA adjuster nut compromises the sound and Gandy argues raising the arm up or down a few mm's actually only changes VTA angle by an inconsequential amount. Sometimes it's no bad thing to have the arm a little lower towards the back, see how it sounds to you with no spacer first. From rega's site:
Arm Height or V.T.A adjustment can be a controversial subject. Rega believes that the integrity of the arm fixing onto the arm mounting board is much more important than the questionable facility of arm adjustment: The arm should be reasonably parallel to the record surface or slightly lower at the mounting. The only time a spacer is necessary to raise the arm height is if the rear of a cartridge is hitting the record whilst playing.
Arm Height or V.T.A adjustment can be a controversial subject. Rega believes that the integrity of the arm fixing onto the arm mounting board is much more important than the questionable facility of arm adjustment: The arm should be reasonably parallel to the record surface or slightly lower at the mounting. The only time a spacer is necessary to raise the arm height is if the rear of a cartridge is hitting the record whilst playing.