The BXR site is no more, but I'm trying to recreate what I can. If you have a copy of the site or some of the files, please let me know. bill@ollav.com
I'm not sure where this page fits into the puzzle, but here's the oil fill modification part: click here.
Below are some images that I either don't have the original web pages or haven't figured out where they go.
[parts] [press]
Press
Parts