I managed to knock off the extended grease nipple in the centre of the front UJ of my propshaft.
Could not extract the residual threaded bit so had to drill & re-tap.

Unfortunately all the replacements I can find have tapered threads.

Anyone know where I can source M6 parallel thread extended grease nipple?

Thanks Greg

like this?

<---- linky

that is 1/4 unf but says he stocks loads of different ones.