Having a difficult time identifying why the rear seal is leaking along the bottom of the PTO shaft on my new-to-me B6100E. I have pulled the plate, replaced the seal and gasket to no avail. I inspected the seal seat (front and back) and did not notice any deformity. Looked at Messick's online parts diagram and don't see a replacement plate listed. Any suggestions on what to look for or to replace to ensure a perfect seal? Leak is not trivial and drips about 1 per 2 seconds so over 24 hour period a significant amount of fluid loss.