From Apollo Lunar Surface Journal: "112:56:28 Aldrin: Houston, Tranquility. Do you have a way of showing the configuration of the engine arm circuit breaker? Over. (Pause) The reason I'm asking is because the end of it appears to be broken off. I think we can push it back in again. I'm not sure we could pull it out if we pushed it in, though. Over. [Aldrin - "There weren't guards over any of the circuit breakers. One got pushed in and one got broken off. So I must have pushed one in and broke one off (with his PLSS prior to doffing)."]"
The broken tip of the CB and the pen:
LMP circuit breaker panel:
Image source: https://www.hq.nasa.gov/alsj/a12/LM6-co04.jpg
How were circuit breakers in LM operated? Push for "ON", pull for "OFF"? Or push for "ON" and push again for "OFF"? If it's the former (which would explain why Aldrin said he couldn't "pull it out" once pushed in), wouldn't it be awkward to grab it with two fingers whilst wearing gloves? What material was the tip of the CB made of so it snapped so easily?