Stanley 120 block plane

[GazPal]

Hi Mr P,

Working on a Record 120 myself at the moment. Lucky for me the wooden knob came off easy. Gentle persuasion with mole grips sounds ok as long as you protect the wood from the aggressive jaws. Try tightening very slightly before undoing, sometimes works. Good luck.

Or lightly strike the head of the button (Protected using a small block of wood) before trying to loosen it. Either method should free up any rust that's grown around the mounting screw and holding onto the button.