For those who prefer metal oil seals. Sold individually. On Puch the right side should be turned the same way the left side is, even if it feels wrong. As in the spring against the crankcase on the left side and from the crankcase to the right side. Check that the oil ducts are not clogged in the crankcase. It should be about 3 mm apart. Also fits right side crankshaft at Sachs 505 2x3 speed