I used my Malkoff MDC 1CR123 most of the day while repairing my snowblower ahead of the impending winter storm. I was working outside and used it to illuminate multiple orifices (fuel tank, fuel valve, sediment cup, carburetor) multiple times so I could peer into them while disassembling...
I’m definitely a clicky guy. Capped or twist mechanism pens and pencils just don’t work for me, unless they have some other offsetting redeeming value like the bullet space pen and Kerry pencil that I carry as backup.
I’m ok with bolt actions as well.