A couple of tips:
Sleeving should be done with stainless steel. If it is being done with brass, find another shop.
The best sleeving I've seen entails putting a thread inside the cylinder, with a matching thread on the outside of the sleeve. The sleeve is then screwed into the cylinder (with appropriate goop). Such a sleeve will not move, and will not leak. Takes a machinist who care to do it, though.
I recommend Autosport Seattle, 2121 Westlake Ave., Seattle 98121 (206.621.1940),
Eelloin