I’ve always used the golf grip method . Cover the plastic twist grip with double sided tape . Spray the twist grip with electrical cleaner solvent and push the grip on quickly and adjust straight . After a while the solvent evaporates and grip is stuck on . Tiger Woods

For future reference , easy outs are very good . You drill a pilot hole and screw the easy out in which has a left hand spiral and this unscrews the broken off screw or bolt . Small good quality set less than a tenner