front stub oil seal on Defender 200tdi 90 1993

Working on a cv joint renewal on Defender 200tdi, 90, 1993. The old stub axle oil seal and bearing was knackered so took them out and ordered FTC840 oil seal and FTC861 stub bearing. Both went in fine but when i put the stub on the halfshaft it feels a little looser than i thought it would, less than a mm of play but just thought i'd check to see what you pros think? I expected to feel the stub seal moving onto the halfshaft