Main shaft in Pump

[Gmann52]

I just pulled the grease cup off of my Gp1200 and found the nut and washer missing . I need to run a die on the threads and was wondering if anyone knew what the thread is they are a little messed up. Thanks

[anapg77]

Re: Main shaft in Pump

Can't remember the specific size, but it was one of the dies that was in my Mac Tools C/V joint rethreading set.

20x1.25???