Well, I'm glad I'm not the only one 'taken' by it

Having read the manuals (thanks) it appears to have two blocks for the
slides - one is adjustable to take up play. This would be great if there was
no play in the screw of course. I did check the slides at both extremes and
there did appeaar to be the same play all over so maybe tweaking one of the
blocks could cure it!

Cheers,

Scott