I use mechanical pencils a lot at work and home, partly because I don't like writing with pen, partly because I do a lot of creative making stuff.
Well, today I went and bunged up my favourite one, a souvenir from Japan with a brass barrel and retracting nib. I think it got too close to some superglue because it wouldn't click. Pushing wire down it didn't help either.
After thinking a bit, I remembered that in the course of this creative stuff I'd got some 0.5mm drill bits and a tiny twist drill.
Drilled up the nib and into the graphite for a bit, and ta-daa, one working pencil.
Not only cheaper and better for the environment, also much better than explaining to Beautiful Wife that I just ruined her anniversary present...