I encountered the same problem on my SM when I recaulked the side windows.
First option: The screws are not long enough to traverse into the wood trim on the inside of the cabin. Procure various length M6 screws and drill through to the inside. Pack with lots of Sikaflex and finish the work with a nice looking ball nut on the wood trim.
Other option: this is what I did. Make the hole bigger, but no larger in diameter than the width of the SS strip (about 14 MM if memory serves me right), clean out the wet balsa with a nail bent to 90 degrees on the end of your drill, fill with epoxy then drill a pilot hole where needed and reuse the original hardware.
SY Eleuthera, SM007
Shelter Bay Marina
Many of the screws that hold the stainless frame of the side windows are loose on our Santorin and some are not holding good enough to allow tightening. It looks as they ar e just screwed through to wooden panel that is used as a packing plate at the inside. Did anyone replace these screws already? What is the best solution to fix that?
SN120 KALI MERA, Shelter Bay, Panama