seized regulating screws

[David Nereson]

    I and others have asked about this before, but I don't remember 
getting any answer that was practical/viable/workable/satisfactory.  Is 
there anything that can be done to loosen up regulating screws that are 
"frozen," or seized-up in the (wooden) regulating rail?  Protek doesn't 
help.  Heating with a soldering iron or butane torch doesn't help.  Has 
anybody tried WD-40 or some rust dissolver like Aero-Kroil?  Do you just 
have to make a whole new rail? 
    As for bending the entire rail upwards, to get the let-off closer to 
the strings, instead of trying to turn, and thus breaking off, all the 
screws, those regulating rail props are flattened such that they prett' 
near prevent any bending at all in the up-and-down direction. 
    What do y'all do?
    --David Nereson, RPT