As it happens, I snapped a jaw from my flat nose with minor force (brittle metal fatigue). Working with Schmitz to get it sorted...
Have you tried to solder it ? Hot snot ?
Did they break just by the pressure caused closing them or was it in a "special" operation?
Let us know how Schmitz handles it.
I've not found the missing jaw to try anything.
I only closed them without gripping anything (was in the process of repairing my eye glass frames, and didn't want the serrated snipes to scar up the frames). And No, I wasn't using a Gorilla grip by a long shot.
As per Schmitz' offer, if I order another pair of pliers or cutters, they'll add a replacement 4221 HS 22 at no cost.