Don't use the spring to set tracking force; use the counterweight(s)and a separate tracking force gauge. That should move them closer to the pivot point.
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You can move the weight closer to the pivot if you have an external tracking force gauge. Set the Rega spring gauge tracking force to zero, then move the counterweight to apply the tracking force measured on an external gauge. The disadvantage of this method is that the Rega spring is actually at its maximum tension to maximize upward force at the 0 gram setting, and this may color the sound.
Hmmm, that's weird. I had a Rock Mk-3 with the Rega RB300 and as I recall the stock outrigger assembly was very light in weight. Has someone made a home-made outrigger that weighs a lot more, by any chance? If so, perhaps you could order or find the original assembly. And if not, I'm sure it wouldn't be that difficult to make one. Any machinist could do this easily... I never had a problem balancing the arm and I don't think I needed the extra weight.
>>The tracking force is set at 3.5. According to the Mitchell literature, doing so deactivates the spring.<<
Correct. The spring applies upward force in Rega arms, not a downward force. But deactivating the spring means that you have to move the counterweight further from the pivot. If you want to operate with the spring deactivated, you'll have to add more mass to the counterweight to move it closer to the pivot.
FWIW, I use a Expressimo Heavyweight on my Townshend-modified Rega and with the Lyra Helikon tracking at 1.8 g. I have the counterweight hanging off the end of the arm tube as far as it can go. If I used a heavier cartridge or more tracking force, I'd have to add mass to the Heavyweight.
Honestly, I can barely detect the sonic difference (slightly cleaner transient/dynamic peaks with the Heavyweight). I think the front-end damping paddle/trough of Townshend's arms removes arm resonance colorations (certainly the tonearm/cartridge resonant peak is nullified) and this is why the difference is so minor.
I bought an extra vial of damping fluid from Townshend back in 2001. He should still have some, as he is still making turntables that use the damping trough (according to HFNRR). If you have no luck with him, I can probably supply you with some.
FYI, the Townshend has been in my second (bedroom) system for 4 years. I went nuts and bought a Walker Proscenium with a Dynavector XV-1 to replace it in my primary system. And yes, it was worth it.