Mechanical Pencil Repair?

[Jon Szanto]

I'm not a pencil collector, but there are occasions where a set will pop up that I would like to have (for the fountain pen). On just a handful of those, if the pencil isn't operational or seems stiff, I'd like to have the pencil mechanism restored so that the entire set is healthy.

That said, can I get suggestions of reputable people who do pencil repair? TIA!