You can buy a new uj joint for these. Most motor factors list it but will supply the rear prop one instead, but there is a place near me that can supply brand new QH joints (4 way spider part) for silly low money.

I had to get one for my 4be Saff TwinCam last year.

If you want, I will dig out their details and the part number which I get the chance?

Cheaper than replacing a perfectly good front prop otherwise.