Low Gear:
I also have no experience with this either, but I recall seeing some images on a web site which pertain to it (of course, I can't find the link now
).
What I saw was a 55 gallon drum, the kind with a removable head. A large hole was cut in the center of the head. An round air filter element (Ford 351 Windsor V8 would do) had been mounted underneath the head--held in place from below by the appropriate air filter cover. A metal ring was attached to the top side of the head, several inches tall and somewhat larger than the hole. And a metal cover was attached to the ring by a hinge.
The purpose of the air filter element was to pre-filter the oil to keep out the larger chunks. And that air filter element is relatively cheap (not to mention inexpensive
). The purpose of the ring was to provide some extra volume to contain the oil as it was working its way through the filter.
I believe the barrel was emptied by pumping out through the bung in the head.
I hope this is reasonably clear.
If anyone else knows the web page I am referring to and can furnish the link, I would be grateful.
On the other hand, the State of Washington has installed some collection sites for WMO near where I live. They are very professional looking and I'm sure were built at great expense to the taxpayers. On the other hand, they may provide some ideas for you. I'll see if I can get some pictures.
Best regards,
Andy Hall