thanks! now about that SF...2d mag uses a 52.1 x 1.90 mm. There is also a thicker lens for the mag 52.1 x 2.84 but I think with the thicker lens the bezel doesnt screw down all the way.
thanks!If it's the same a 6P it is 28.6mm
http://www.flashlightlens.com/str/index.php?app=ccp0&ns=display&ref=apps_specs