On the updated stub axle/bearings, the seal is part of the bearing - there is no separate seal. To replace the front bearing - remove wheel - remove brake calliper - remove split pin from castellated nut, remove nut and thrust washer - pull off hub with outer bearing - remove inner bearing, assuming it hasn't welded itself to the stub axle! Remove shim washer against upright - press or drift races out of hub, assuming hub isn't damaged - press or drift new races into hub - grease new bearings and smear grease on races - replace shim washer, inner bearing onto stub axle - put on hub and outer bearing, ensuring that seals seat cleanly within hub - replace thrust bearing and nut - tighten by hand whilst spinning hub clockwise - nip another eighth turn and align holes for split pin - replace split pin, calliper and wheel