This cartridge alignment protector allows the proper setting of the cartridge offset and overhang.
“If the cartridge is not mounted properly the right side of the stylus will be tracking the groove at a different “recording time” as compared to the left side of the stylus. This will cause muddy sound reproducing and loss of detail.
This simple, inexpensive device allows the proper mounting and adjustment of your cartridge as far as offset and overhang is concerned.”
Comes with instructions (EN/English).