my Low dollar 318 hop-up project

Not telling you how to build it, but FYI, the mancini racing "refresh" kit is a good start.

Main & rod bearings, rings, and gasket kit for $200...

http://www.manciniracing.com/sea318enkit.html

Run a quick ball hone through it, and you have a nice start...

(Where are you at in IL? I have a ball hone I can bring over to play with if you're close enough to me - southwest burbs of Chicago...)