Search:

If you want a harder tip for when you have the rubber foot removed, epoxy metal in a broken HSS drill bit (tip, not shank, as the shank is not hardened).

Any chance of a link?

They seem a good accessory, trekking pole, tent pole.

You can get trekking poles where you can remove the top knob and they have a camera screw attachment so you get a camera monopod.

A camera...