What to put on bottom of pf tek cakes in pressure cooker

So you don't get rattling noise also for it not to crack a cloth?

Using extra mason jar lids at the bottom of the pressure cooker is a good idea.

metal on metal. = two thumbs up

Some use a clothe but make sure You elevate the clothe with extra mason jar lids...
if You do not elevate the clothe, the pressure cooker's heating surface will burn the clothe
through the thermal heat provided.

Ty very smart