Probably you have to use a different color spring ( with a different color) so that you can adjust the tone arm/cartridge you're using. You can by a kit box from:
ORACLE AUDIO TECHNOLOGIES 2001 inc.
4124 BLVD INDUSTRIEL
SHERBROOKE, QUEBEC, CANADA
J1L 2S6
The kit have full instructions to calibarate the Alexandria, as well as spare parts to use later on.
wonderfull.