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Great post! I just got kits to rebuild my distribution block as well as the hold off valve. What did you use to clean up the inside of the bore? All I could get in there was a bottle brush but wanted to hit it with some really fine grit sand paper or steel wool but nothing was small enough to get inside there.



I cut some fine scotchbrite into narrow pieces and carefully cleaned the bore using orange cleaner to lubricate. The tee valve is the smallest bore but open on each end, so that helps cleaning. Both the metering and prop valves have a cavity at the bottom - I used short blasts of glass beads to clean these.