There was a point when it did not leak.I did not offset the seal and will this time along with some yamabond over the sides.I will look closer on assy after looking at things apart.

A wealth of rear main leaks and possible fixes.

https://cse.google.com/cse?cx=partner-pub-0048081641434287%3A2223449621&ie=UTF-8&q=Rear+main+seals&sa=Search&siteurl=board.moparts.org%2Fubbthreads%2Fubbthreads.php%2Fubb%2Fshowflat%2FNumber%2F2303779%2Fgonew%2F1%2Fmill-rb-rear-oil-seal-retainer.html%23UNREAD&ref=board.moparts.org%2Fubbthreads%2Fubbthreads.php%2Fforums%2F1%2F1.html&ss=11074j14501192j15#gsc.tab=0&gsc.q=Rear%20main%20seals&gsc.page=1

I have no idea why my recent post went to miniscule font and why the posted URL cannot be merely clicked to take you to the posted URL.

Nevertheless less, I merely keyed "rear main seal" into forum's 'search' to find a wealth of threads on your topic

ok Thanks.Let me say that just passing on info and not discussing it is what holds back ideas.I know you have good intentions though.

I got a newer fel pro BS 40240 and it has stiffer not hallow side strips that look like it will be easier to put in without collapsing.