An epoxy cement will hold them, but PP handles are still made and will work with your faucets.
: Terry, : I remodeled a bathroom about 9 years ago and used Price Phister fixtures. Over the years of use : the porcelan knobs now spin on the brass inserts. I have tried to repair them using waterproof glue : but it did not hold for long. Is this something you have run into before? Please advise if you can.