I've started fixing my 100 year old Buescher C Melody, and I've ran into a bit of trouble. Most of the keys have been removed, but all of the main keys, along with a few side keys, and the screw for the octave key on the neck are stuck. I've used a ton of WD40 and WD40 rust removal, and although they feel a bit looser, I still can't get the screws out. To make matters worse, they are also stripped a bit. How can I get them out, preferably without breaking them? Also, I'm a little concerned that I'm not twisting the screws the right way. Is left still loose, or do I turn it right to loosen it?