0-200a crankcase seal oil leak

Hi all I have just bought a Jodel DR 1050 powered by a 0-200A. It has had a top overhaul done. New millenium pistons and barrels. I have been chasing oil leaks/weeps. My breather fitting on the crank case was loose. Tightened up. I get oil through the breather tube. Not a lot. I get a small...