Grease zerk thread size?

[bherr]

I have a Tarter RC4 mower and the grease fitting in the u-joint on the tractor end of the pto shaft is missing. The shaft is Italian and I'm reasonably sure the thread is metric but I have no idea what it is. Anyone know what the thread is?

 

[ptsg]

Take one from the other end to measure? It could be anything from M6x1, M8x1 or more common, 1/8" BSPT.

 

[anomad]

You can get assortment packages very affordably online or at Harbor Freight. Handy to have on the shelf.