I just bought an LPT-200-1 as a gift. I also have an older model LPT-200 (with black stand). The LPT-200-1 is larger and requires two hands to fire. The task is to use the thumb of your right hand to press the small button on the right side, use your left hand to press the trigger of the detonator on the back, and then, while continuing to hold both, use your right index finger to press the slide to shift off/lock switch to lock-on. On the older LPT-200, you would turn the knobβ¦