So Ive got a little 2.04 oz stainless ~10cm from a chinese flea market vendor that I needed a lid for. I finally got around to making one and was pleased with how it came out.( None of the normal items fit it). The lid weighed 0.13 oz, took about 20 minutes. This lid is good for boiling water, I wouldnt use it to cook food because would get in the crevice on the lid and be hard to clean.
I was happy enough with it, I made another for my SP600 since every lid I had for it was heavier. Those are the pics I took here.
Start with soft al foil from the craft store. This is super soft and malleable, usually used for wind screens.
Flatten it by rubbing it with an item on flat surface. This will harden the Al a bit also probably. I used a wooden dowel. then cut out a piece that overlaps the pot by about 1/2" all around.
Form the al over the lip of the pot gradually with the dowel, then under the lip too to give it a place to bend. Unbend it a minimum amount, then remove it.
On a flat surface, start with the edge of the dowel and rebend the al where it fit the lip. Go gradually around, and smash it tightly, a little at a time. Make a lip about 3/16 " or so.
Turn on side, and along edge of counter, roll the edge tightly at 90 degrees to the lid top surface. Dont worry about wrinkles, they will mash thin, and add strength too.
cut the lip off with scissors to about 1/8". Put a piece of foil tape n for handle. Done.
Perfect fit, no sharp edges, and surprisingly stiff.