Ah, just blew the photo up - that isn't an older model my bad. Still the current series Supertool 300... I'd pull it apart and give it a clean with either a small brass wire brush, a bit of either white or purple scotch brite or a bit of stainless wool with some light oil on the metal work. The screws are one small one with a male thread, and the other is longer and the small one screws into it. Take note of where the spacers sit before you pull the pin out, and there is likely a spring in there somewhere for the release lever. Also, take a photo of each end so you know which tools go where!!!
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