The new replacement rope seals are of inferior quality to the old ones containing asbestos fibers.The new seals are especially prone to leak if you have replaced the seal halves without pulling the crankshaft.Forcing the upper seal into place ,stretches the fibers, and promotes leaks.On the Stovebolt links are several vendors who sell NOS asbestos seals.I don't like to recomend certain vendors but I believe Stovebolt Engine Co. has them.You may have better luck with the NOS seal. But like Bill says, make sure its the seal that leaking.