Sorting out cupboards and digging through boxes today, I found this in a box of music-related bits and bobs but I’m not sure what it is. Any ideas? It’s about the size of one of those inserts you used to get to fill a hole in a 7” single that had been in a jukebox but I don’t think its one of those because of the markings.
It’s used to ensure you have the correct overhang of your stylus… Marantz have their way of doing it. I’m sure you still have the manual… no?
No manual and no Marantz turntable, or any other Marantz gear. 
I have a ruler-style protractor for cartridge alignment on my Linn.
From the manual: “45 RPM spindle adapter that holds the key to the cartridge overhang distance. Marantz instructs the user to place the adapter on the spindle with the arrow pointing toward the rear (due north azimuth) and then set the overhang with the stylus tip touching the cross on the adapter. The arrow and the cross on the adapter provides a vector from the center of the adapter when setting the overhang.”
3 Likes
Translate the cartridge along the headshell axis until the stylus tip satisfies the overhang constraint relative to the spindle datum, thereby minimizing angular tracking error across the groove’s radial vector field. Verify alignment at null points where tangential deviation asymptotically approaches zero…
End state: a 0.3 mm adjustment that yields a 300% increase in smugness and a statistically insignificant—but spiritually profound—reduction in distortion. 
5 Likes