As Peter say above plus,

It might be worth removing and checking the cross-slide lead-screw and nut for damage and swarf, check the slide ways with the lead-screw removed, it should slide freely

That Kerry looks a purposeful device :)

Post some pictures of the slide, if you can, it'll help to determine what's actually been changed.

P.S. I know a guy with a Kerry (His is one of the lathes pictured on Tony's site) I'm sure he'd be willing to help you with anything specific.