John Stevenson RIP
Said to me just take up the end float use a dti if possible
That being said you will many different views/advice/WHY as a squirrel has fleas 😳
When I did my sx3 I did as John recommendation and ran the spindle in the lathe to bed it in checking the temp and varying the speed for about 30 mins to 1 hour I then found I needed just a further nip , ran the lathe test again to be sure
It’s been a good few years but it just gets warm at top speed after extended run time ,but I suspect that is heat from the tool migrating up to the spindle
Just in the process of doing the same job to my other mill the cost of the bearings £300 , glad it’s not a Swiss made job else I would be looking at £5K 😱
Have fun , take care and be safe
Stuart