rega heavyweight for zu 103

whats the best heavyweight for a rega rb 300 to handle a zu 103 cart. at 14 gms.
I'd recommend the Groovetracer 150 gram counterweight.
I used modeling clay to stick a penny on the back of my Express Machining "Heavyweight". It's probably still a little light, but the sound and soundstage are improved.
Clearaudio Turboweight works.