I have an OM series DJ cartridge.  What is the best way to align and mount it to the headshell itself?

First of all, you may want to use the headshell weight included in the package, which should be sandwiched between the headshell and the top of the cartridge.  This will provide more weight to the cartridge body, which can come in handy depending on your turntable and tonearm.  Secondly, it is quite important to achieve the proper overhang by means of the gauge that should be supplied with your turntable (it is the white plastic piece included with all Technics 1200 turntables).  With the cartridge mounted loosely in the headshell, attach the overhang gauge to the back of the headshell, with the protruding plastic shaft sitting below the cartridge.  Align the diamond tip with the arrow found on the end of the plastic shaft ‚Äì that will provide the appropriate overhang.  Tighten the screws carefully, as not to upset the alignment just performed.  Then follow the above directions for Tracking Weight, Anti-Skating, and Tonearm Height.

Note: If you do not own an overhang gauge, here are two alternative options that will assist in achieving the appropriate overhang:

1. Use a ruler to achieve a distance of 52mm between the stylus tip and the inner cuff of the headshell.
2. Align the front top mounting portion of the cartridge to the very front of the headshell's mounting holes, so that the front portion just covers all of the empty space.