Sleeve a master cyl?
I can't imagine that to be a DIY kind of repair ...
This is a single-system m/c off of an old (66?) GM passenger car according to the buyer's guide.
I'm thinking that many of us (myself included) occasionally tend to buy "the best that money can buy" in the hope that it will last forever.
If we were to stand back and looks at it realistically, most our hobby cars will likely never be driven more than 50,000 miles in our remaining lifetime ... during ideal conditions to boot.
Here in Canada ... I think we pay a little more than you do in the US.
NAPA United 36242 (new) "joe retail" price is $181.79
NAPA TruStop 10-49204 (reman) is $54.79
At the reman price ... I seriously doubt that you could buy the m/c repair kit and a brake hone.
Buy 2 remanufactured units ... one for the first 50 years (or 50,000 miles), the second one for the next 50.