Thank you chaps for the replies - managed to get it done this morning

I think walking away from it last night helped, stepping back and looking at it again this morning.I got a 8mm drill bit and hand turning the drill bit (as in not in the drill just the drill bit with me using my hand to turn it) it cleaned up the hole the one end where the bearing wouldn't drop through.Don't know if it was my eyesight last night -red mist

- or what but I couldn't see anything that was stopping it - but now the bearing goes all the way through the hole.
Another thing I didn't notice last night was when trying to fit the sliding dog, the normal way, this stratos one has chamfered edges to make fitting easier,basically you do it back to front,rather than pushing down you pull it up (page 88 of the sticky book 2nd edition).
Anyway all done now, using the 2 sliding dog method - took about 30 seconds this morning, compared to last night where I suddenly suffered from about 90 minutes of tourettes. Again thank you both for your replies
