Lead holders > wood pencils > mechanical pencils. Mechanical pencils are not my favorite for marking. .05 lead breaks way too easily and .07 is too wide to be of use for anything but rough cuts. I use a lead holder with 2B lead. Yes it needs to be sharpened too, but the point is very fine and yet very sturdy and doesn't break easily. The sharpener for these leads works one handed if they're secured to a desk/bench/cabinet. I have a few from college drafting days, but they're still available and pretty inexpensive.
The lead retracts into the pencil body simply by pressing the button on the back and and tilting it up. When I'm going to mark a board, I hold it near where the intended line will be, press the button and the lead slide out to be exposed. I also have a very large lead holder I use to mark boards when I'm breaking them down.
Those are two sharpeners for the leads. The red one is new and is clamped to my cabinet with a clamp that comes with it. The black sharpener is probably 50-60 years old and maybe older. I move that around the shop depending upon where I'm working. It's pretty heavy as it's a cast metal with metal internals. I put some mole skin on the bottom so it doesn't move around. I use the little yellow plastic pencil sharpener for the larger lead. I also have an old Boston Champion pencil sharpener for wood pencils mounted in the shop. If I get lazy and not near a sharpener, the utility knife in my pocket works too
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