Half round balls can be placed behind the thigh under the flap of English saddles to assist in correct thigh position. Position the each half-ball under the saddle flap so that your thigh rolls onto the inner thigh. This will help to have the “flat of the thigh” against the saddle.
CAUTION: Half-balls may fall out while riding so be sure your horse is not disturbed by testing this before riding. Drop the half-balls from the position under the flap to be sure your horse remains calm.