Acme thread size for an Okuma LS tail stock

[Thespinshop]

Hello, new guy here.
My daughter went past the end of the thread on the tail stock on my lathe and messed up the first couple threads.
I was looking to see if anyone knows what size acme thread it was so I could get myself a tap.
Thanks for any info.

 

[michiganbuck]

If you have it exposed this might help.
Metric Trapezoidal(ACME) Thread Dimensions & Specifications