If you can get a syringe to fit in there maybe you can squirt lube onto the contact areas. If you're trying to work on your spacebar stabilizers, you may be able to get away with not desoldering everything. I managed to fix my KMAC spacebar stabilizer without desoldering it. However, if it's at any other location, you'll probably have to desolder and take the stabilizer out. Why? You may be able to force the little slider out but the wire won't go back otherwise. And why can you do it with the spacebar? It's at the front and easily accessible if you tip the board.