|The motor rotor in the boot of the Super Snipe.|
After balancing it is now 0.550 at 328 degrees and 0.532g at 320 degrees.
It sounds a lot like it was statically balanced originally.
They also balanced the coupler after balancing the rotor - it'll need painting again (I'll probably stuff the balance!). You can just see the shaved part of the coupler on the top (red thing on end of rotor).