Well new swivel bearings, back seal and the plate that holds it in went on today, (those bolts that fix the swivel to the axle were a bit of a pain but 2 spanner trick worked fine) refilled with one shot and put it all back together and still the same play, removed the only shim and still the same. could the pins themselves be worn? I'd put the existing one back in. Anything else it could be? Chrome ball looked fine, no rust or anything, old seal seemed fine but replaced it anyway. Could it be the wheel bearing after all, did try isolating it with the brake before and it was replaced about 18 month ago.