Van den Hul, Ortofon and Wally tractor all make mirrored alignment tools with center line indicated.
For tangential arms like yours, overhang is achieved when the stylus is set exactly on "that" line all the way across the record.
The mirror surfaces will also be helpful in judging your cartridge azimuth and VTA.
For tangential arms like yours, overhang is achieved when the stylus is set exactly on "that" line all the way across the record.
The mirror surfaces will also be helpful in judging your cartridge azimuth and VTA.

