BF support bearing query

All the pics (Hiwin and clones) I've seen of the BF support bearing show the end of the ballscrew almost flush with the end of the bearing see my little sketch:
Attachment 25246
However there's no dimension given for it's exact position in the mount, even in the Hiwin book. I guess there's a certain amount of freedom of movement in the BF as it's billed as a support rather than fixed bearing, but I'd like to get the initial position more or less in the centre of the allowable range, and do I need to leave some space outside the bearing in case the end protrudes a tad I wonder? Any wisdom/experience on this would be gratefully recieved, thanks.

The bf bearing is floating in the housing so the bearing is fitted onto the end of the ball screw and retained with a circlip. This means you try and arrange the bearing housing so that the actual bearing is in the middle of it.

Cheers Clive, that's clarified exactly what is floating and I know where to sit the thing :joyous: