I've been looking at the counterweight issue for my RB300 lately and there seem to be quite a few options.
1) Michell Technoweight, including cart head weight adjustment
2) OL structural modification, mostly to replace the plastic stun of the RB250 with a metal one and add a different weight
3) Kerry F2 titanium counterweight. Its hole is off centre to lower the gravity point
4) Groovetracer counterweight , about same as above
5) Pebbles counterweight set (incl. stub)
6) Clearaudio Turboweight (I have already ordered this one for my RB300)
7) Expressimo counterweight (similar as above 3,4,6).
The prices range from 50 euros (Pebbles) to 170 Euros.
1) Michell Technoweight, including cart head weight adjustment
2) OL structural modification, mostly to replace the plastic stun of the RB250 with a metal one and add a different weight
3) Kerry F2 titanium counterweight. Its hole is off centre to lower the gravity point
4) Groovetracer counterweight , about same as above
5) Pebbles counterweight set (incl. stub)
6) Clearaudio Turboweight (I have already ordered this one for my RB300)
7) Expressimo counterweight (similar as above 3,4,6).
The prices range from 50 euros (Pebbles) to 170 Euros.