Opti-Pro Plus head removal?

Noob question, but I picked this up at a garage sale for a couple bucks and was going to play around with different emitters. The thing is I can’t seem to figure out how the head comes off to get to the emitter. Is it press fitted, threaded, glued, or a combination of these? Thought I’d check with the experts here before I go medieval on this thing.

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Just in case anyone else gets one of these, it turns out everything is just press fitted. Emitter is just pressed into the housing which is pressed into the barrel, and the switch holder just slides out. Now I just have to figure out how to tuck a driver into one of the voids without shorting something out in the process.