Thanks ! Will try tonight.

You can get powdered graphite in a tube that may work for that. Hard part will be getting it in there.

Spills of graphite powder can foul up the white leather on the flappers easily, and attach itself on too rough paint surfaces, hard to cleanup maybe. To be safe i would disassemble the whole keyboard and remove the nasty rocker from its slot. Keep track which rocker fits which slot by numbering them; with hand made instruments sometimes the width varies a little. - Nout

Ok. Couldn't get the powder to to the area but was able to get Howard's wood wax in the crevice using a metal ribbon ruler. Worked perfectly! Thanks for the suggestions!