Tone arm counter weight

To use to GT counterweight, you also replace the end stub that comes with the counterweight.
It may take some effort to remove the original one. Patience, and vise grips will get the job done.

@audiosens, I put a black Groovetracer on my RB300. It looked like it came with the arm! I bought my counterweight before the end stub was available. The counterweight in no way interferes with or disables the arms spring-loaded VTF adjuster. I sold the arm (which I had Cardas-rewired) a few years ago, and the counterweight separately.

I can attest to using the dropped (underslung) counterweight.  This weight stabilizes the arm and provides better sound.

tablejockey, It was quiet easy to remove it with rubber band and vise grip.  The result wit GT counter weight is better stereo separation left right and better high's definition.  And for the sub platter, more timber acuracy and depht sound stage.  Very Happy with the GT up grage