[Amps] filament choke screws

[Charles Hedrick]

Hi all,
Still working on the Hunter 2000C.  It burned the wire from one side of the
filament choke to the pins of the tube last night.  On inspection the screw
through the mounting insulators on the tube end are rusted.  I can't get the
screws out without fear of breaking the ceramic insulator they go
through.....they're stuck in them.   Suggestions?????
Thanks in advance.
Cam
WA4JKW