That longboard looks extremely nice built up.
I'm in the process of my apprenticeship as a Journeyman. Nothing spectacular, just some stab pins for a job, since my mother wanted to know what I was learning. Since shes curious like that.
These get hardened, Ground, then black oxidized. (Basically Gun Blue)
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They end up coming out of bushings to check certain areas of parts to make sure they are to tolerance/size. Stab pins made from 0-1.