I managed to get the two opposing angular contact ball bearings out today, looks like they are a matched pair as there is no shims between them.
I'm thinking I could make a shim to put between the outer races of the bearings to give the bearings a bit of preload when they're tightened back up.
Not sure how big to make the shim? reason being that the end play in the bearings is 0.04mm when measuring it with the saddle at full travel at either end but when the saddle is in the middle of it's travel, I can only get 0.01mm end play showing on the clock, this is as the slides are fairly worn in the middle but not at all at either end, how much end play is acceptable?
Don't want to make the shim to thick and ruin the bearings!
Cheers
Chris