hi.
i looked for a long time, even called paul. said he would not sell "any parts" .
i took some nylon from a cutting board and made some round 7/16 stock and cut some glue lines in them, ( had no means to thread em) epoxed them in, drilled and tapped for 5/16 18 , ( might need to use smaller drill bit next time- 1/4 maybe) tight enuff but not as tight as original.
so far so good, use it a good bit and holding up well.
carl shealy