To people who use the power tank pen, where do you keep it? I usually keep my pen in my left shirt pocket, using the clip to hold it there. when I tried the power tank pen the last two matches of the season (I'm refereeing in Norway), it fell out both times. It is relatively heavy, and the plastic clip is not tight enough.
I have now bought a few fisher space pen refills that fits in parker pens and put them in my Parker Jotters. The Jotter's clip is tighter, and it is not as heavy as the power tank, which should mean less jiggle when I run. The Jotter has never fallen out, but I have had issues with the ink in cold and/or wet weather. Hopefully this will be the best of both worlds.