Hi Stevin,
what servo, what servo arm and distance to the shaft of the servo are you using?
It's close with the standard carbon servo arm, but it does not rub (did check one here).
And usually it's closest at servo center, with the servo arm rotating, the distance to the frame increases.
But since the lip at the back of the frame has no particular right to exist, you can sand or cut it if need be.
Kind regards
Eddi
Born to fly ...
forced to work.