Hi all !! Apologies for not responding for a few days, had a bit of trouble with my laptop and had no access to internet. Anyway, after reading the suggestions I built myself a disc sander on the lathe and also built a jig to make it easier to get it square. Now doing this has allowed me to test how square the ends really are by using a try square. I've got them pretty dam square, no light passing through the blank and square, but unfortunately I am still producing concentric blanks. I'm at my whits end as to what I'm doing wrong
So tomorrow I'm going to have a go at what Pierre suggested, turning the blanks 1/4 of a turn during turning. Quick question, how does this work ? Many thanks Eddie ! :)