Dear Mahlernut:
Mahler is wonderful. I delight in the 4th.
There is a VTAF configured for the three point mount Rega arms, including the RB700, RB900, and RB100, also the RB301 I believe. Please see the posted image. The price in Lacquered Brass finish(protective lacquer over engine turned solid brass) is $180 U.S. Options: add $30 for the Smokey Silver finish (protective lacquer over nickel plate over engine turned solid brass); add $30 for the VTAF Teflon Upgrade.
I don't specifically know if the stock counterweight system for the RB900 is substantially better than the stock counterweight system for the RB300. That said, users of the Pete Riggle Counterweight for the Common Man (CCM) find the CCM to be a big improvement over the stock counterweight of the RB300 arms.
Best Regards,
Pete
