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I got the new, lapped valve installed and the engine back together. With all the trials and tribulations with the lapping, I wasn't at all confident that I had accomplished anything. But, I gotta say, I'm thrilled with the results. The amount of leakage throughout the engine is now pretty minimal, far better than before I started modifying it to be reversible. And, in the end, I didn't use any o-rings on the rotary valve. I may not be an expert at it, but I am definitely a big fan of lapping now.Video coming next