I wanted a knob for a MYOG pot lid and cooked up this one gram goodie from odds and ends.
I cut the end off a can using a safety style can opener, eyeballed the center and drilled a hole suitable for a pop rivet. Pop rivets have a center that looks like I nail and I pulled that center piece out, leaving a plain aluminum rivet. I cut that to length by simply nipping the end off with a pair of lineman's pliers. I slipped the rivet through the hole in the lid and secured it by sliding a section of silicone air line tubing on other side. You can make the knob any length you want. Leaving it a bit longer lets it fold over and plenty to grip. Weight is one gram :)
The lid with center hole and the evolution of the rivet: pop rivet with center, full length rivet, rivet trimmed to length and air line tubing.
Rivet in place from the bottom:
Finished knob from the chef's side :)