the OP reflector of the current production version of E09 totally resolves the problem with the hotspot beam beauty but if prefer the throwiness of the SMO reflector. in everytime carry "(24-9)"/7 (8 hrs sleep and 1 hr for *oo and *ee *gg) it could really replace a 1xNiMH light such as E03
Chloe showed us how to mod the light in her very nice review work.
Yes the back spring is strong and the threads are long. With added silicone grease (sticky stuff yuck!) the head will not screw off even in unscrewy pants pockets ;)