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Review title: twist-on doesn't always work, expensive lamp module
Product review: Twisting the flashlight on sometimes doesn't work. I've done my best to ensure that this is not operator error: the internal tray, lamp module, and spring are undamaged and all parts are clean; the batteries are good, the spring seats well. It looks like a design (or quality control) flaw, in that the tabs from the battery tray do not go up far enough to contact the lamp module until the lid is tightly seated, causing inconsistent operation and leaving no additional leeway for metal component wear. Sometimes a small whack at that point will get it on, and reassembling it may help - hit or miss. Coming on every time is pretty much job one for a flashlight. My other complaint is that a replacement xenon lamp module is half the cost of the flashlight at ~$11, hydrogen-absorbing catalyst pellets or not. Two stars for a sturdy case.
