DB's Quick Lock Pin

I was asked to post these lock pin from a bunch of viewer of a webinar I gave recently.
I happened to have been using them to hold a panel in place.

Even though I use them for many things, these are pins I use on my CNC and Mill hold down's locking pins, they don't bust bits as often as the metal ones do.
I made molds and cast a bunch in very hard resin, non injection molding thin walled parts is a pain, and I have them in varying lengths and sizes.
I found that the 3D Printed ones are qu