Well
sdowney717 I have read & read & looked at your pics & your write-up and pretty well understand everything up to about 95% of everything you did but still a bit unclear how you sealed the 2 inter tubes.
I have a By-Pass filter housing a lot like your 8N, but not sure what it came off of. Has no bottom drain and will have to drill and tap one. Other than that mine looks like yours. Oil comes in bottom up thru small tube and out small hole towards top where bolt that fastens top cap on screws into small tube. My spring on the bolt is just a coil spring, no hold down washer thing like yours. Also I have no rubber/ felt washer you described that the tubes fasten to at the bottom to seal.
I have found that for the outer tube a piece of chain link fence tube is about a good size to fit inside a roll of toilet paper snuggly.
As I understand you soldered a Tomato Past can to the outer tube leaving about 3/8" to dig into the TP to seal it at top end. Other end of outer tube you soldered a beveled/ground washer inside that tube that slips inside the TP and fits at bottom of the TP roll.
Then you have a smaller inner tube that is pressing down on the beveled soldered on washer thats inside the outer tube. The spring is what holds tension down on the smaller inner tube and everything.
What did you use for the smaller inner metal tube?
There is a spacer goes in first, then the SS grate/plate, then the rubber washer, then the TP with the bigger innet tube slipped inside, the the smaller inner tube, then fasten the lid on.
How close did I get things figured out? Please let me know what I'm missing and not understanding.
TIA James