Decided to go the "Shim" route, as twatting the plate seemed a bit wrong. Also I would think that the indentations, front or back, of the screw holes would cause the Balance Cock to be on an incline, maybe causing the jewel to be out of alignment vertically.
Anyway this is what I have done.............
Shim made from edge of tablet strip......
Cut out with scalpel....
Holes for screw posts.....
On the plate....
All done and running lovely..... :)