I found this in the data sheet that came with a kit I bought.
yf data Although the modification is for specification I.D.-F, which is not your application, it shows a method to leak check and re-shape the ball seat that might be usefull. The instructions didn't scan very good so they are as follows--
"Perform modification proceedures if applicable as follows:
1. Remove from pump passage: retainer, weight and disc check (see Illustration A).
2. Use 1/8 steel ball, drop it into pump passagem tap it lightly with a 5/32 brass rod and hammer, to form ball seat (DO NOT TAP ALUMINUM BALL). Then remove 1/8 steel ball (See Illustration B).
3. select 1/8 aluminum ball, drop it into pump passage.
4. Check ball seat by pouring a few drops of gasoline over the ball in pump passage. For a good seat, the gasoline should remain visible for about 60 seconds.
5, Install weight and retainer from kit. (See Illustration C)."
