rear main leak

I think when u use the factory seal retainer u should mill off .010 off the ends to make it flat and level and to give it a little more crush. I seen a thread on that somewhere, but I couldn’t find it. Kim
Ye, I went in that direction using fine sandpaper and a pc. of glass (flat surface) I wasn't taking any surface to chance. I may have taken .001. of the mating surface.