With early models of the Maestro version A, the main VFO tuning knob was slightly out of balance and would continue to rotate if the finger dimple was at the 9-12 or 12-3 o'clock position. To resolve this problem, FlexRadio provides a VFO-A Balancing kit that adds a counterbalance weight to the knob that moves the center of gravity to the center of the knob.
To order the kit, just submit a HelpDesk support ticket and request the kit. It will be provided free of charge.
The instructions for installing the VFO-A Balancing modification is attached to this article.