Leo,
These pre-made knobs are very nice. I have ordered a few score, of different types, to see how they will work.
I have also (because I am an American who does not understand thrift) ordered several of the $5 original manufacture press-on knobs. I have not installed them yet because I would like to try making replacement resin knobs from a silicone cast of the originals.
I will report back on both experiments.
-- Jeff Dutky
