Lee, you replaced them because they were chewed up on the
INSIDE Mate, you're losing the plot you know..... no-one can see the inside of your BB
A decent sealed BB will last years unless you ride it heavy round dirt tracks every day bud - just put the original bearings back in and if you're still twitching, pop the little bearing covers off the new ones and put them onto the old ones
See you at MK again bud