recommended grit to hone cast iron hydraulic hand pump bore with ball flex hone for leather cup seal?

[tomjelly]

I've only used their catalog or website before, I didn't know they offer a service like that....

 

[Milland]

McM has some great resources, take advantage of them. But be aware that some of the salesfolk are better than others, you can ask for a applications rep if you don't get the good ones.