Is there any way to PERMAMENTLY eliminate rear main oil leaks?

rubbery ones slowly squish out sideways one way or the other, eventually split and push out at the bolts, keeping that thing on the rail becomes hard work you don't need...

Glue a cork one to the cover, smear the oil off the edge of the head and do up the bolts to spec. job done, anything else is a waste of $$$

dave