briggs keyway dimensions?

#1
Anybody know the dimensions of the stock briggs keyway slot?

Im thinking it's 3/16" wide but Im not sure how deep.

I have a 5hp crank that has the wrong size pto shaft, its 7/8" and I am turning it down to 3/4" and will be cutting a new keyway on a mill.

I thought it would be easiest and maybe cheaper to just buy a different crank that has the 3/4" shaft, but this is a definetly a low time motor and I dont wanna throw in a used up crank.
 
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