Restoring World War I Antique Trench Lighter --- AF invention

This World War I Trench lighter in in dire need of restoration and repair. It's missing some parts and rusted badly. I started restoring this lighter long ago but I continued now because I finally came up with a plan to make new screw for the bottom. Th lighter was made by Imco. You've seen me restore number of Imco lighters previously. They have usually interesting mechanics. Unlike the previous lighters, this design was also made by other manufacturers.