Since you could lift the action to look underneath, you can rule out the stack binding on the pin block. My guess would be for a leg or lyre screw had been replaced with one (or two) too long, protruding into the key frame back where you can't see. Also if the keybed is constructed with lowered panels, perhaps something else is jamming. If the joints between glued beams have a gap, a piece of wire or other item is also jammed. Get under the frame with a long flex steel. -- Regards, Jon Page
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