Slide rule cursor misaligned, how did happen?

[Benjer]

Supposing you get your slide rule aligned as described in Garth's post, I noticed that both the top and bottom cursor end pieces are each cracked. Some models of K&E slides rules have self-destructive cursor end pieces which eventually crumble to bits, (K&E rotting cursor syndrome, or KERCS), and there's nothing that can be done to stop it. I've tried gluing the pieces back together and they've crumbled apart into smaller pieces.

Other cursors from K&E don't suffer from this, so replacements are sometimes obtainable, usually by taking the pieces from another unwanted slide rule.