In reply to Toerag:
With an advertised size range of 3mm to 6mm, I doubt that even the smallest Ball Nut will fit in a crack for which a 3mm camhook is too fat. While Ball Nuts are clearly very useful for more normal blade and upwards crack sizes, knifeblade cracks - ie down to about 1mm - are just too thin.
To the OP: Crack'n'Ups?
Post edited at 12:34