Found these whilst having a clear out. My grandad brought them back from the war and was wondering if they could be made into mods. Although it says 20mm on the bottom the cases are just over 23mm at the base and just under 22mm at the top. Bit longer than Paps v3 in 18650 mode. I'm a long way from doing anything with them (want to try mod making at some point). Has anyone tried converting anything similar? Just after some thoughts for now.