I used to carry a Fisher Space pen in my pocket. I now carry a Zebra F701 conventional pen with a Fisher refill.
Fisher makes conventional pens too, but they cost more and are not as nice.
The video below shows the conversion. The F701 has a resin bushing to keep the point of the pen from wobbling. That bushing is slightly too small for the Fisher refill.
Various methods are recommended for opening up the bushing. Some show using a drill bit to open it up. The video below shows trimming with a knife.
My approach was simpler. For the first month or so, I would click the pen to present the ball point, and it would have some resistance. But it would not retract without pressing the point back on the paper (or other hard surface). Eventually the bushing opened enough for smooth operation.
If you are patient, then use my technique. Otherwise the video shows the process of trimming the bushing.
Either way, the Fisher refill is an upgrade. The original refill is decent, so use that up first, and switch. I didn’t do that. I switched as soon as the Fisher refill arrived (from Amazon). The part number is shown in the video.
The F701 is all stainless steel, and with the Fisher refill, possibly the most likely to survive in a rough environment.
While we are on the subject. My favorite mechanical pencil (I’ve had expensive ones, but I like this one best) is STAEDTLER-MARS LTD Pencils, AKN as “Riptide” pencils. Amazon sells these for just over $7.00 for a package of 6 pencils plus extra erasers.
I see that same package offered online for $5.00, shipping extra. It might be cheaper to just walk into Staples.
The best pencil eraser, regardless of price is the Pentel ClicEraser. About $5.00 for a package of 3.