[dizzyblonde]

I know my headbearings are on there way out because

the handlebars, when you turn them from side to side, are loose, instead of a firm smooth movement

every pothole goes clunk, off curbs slowly-clunk well anything really

turning in slow movements, u turns etc feel like the front end is well trying to fall in on itself or too sharp, it almost feels unstable

and they've been looked at before and niped up a bit, but its got worse over the year progressively

someone else will give you a more technical explanation i'm sure