Mark.. I just had all that stuff out on my TO last week myself. That spring can be easily obtained for a couple bucks from a AGCO (Massey) dealer.
The "screen can" faces with the open end down so as to form a cover over the screen. The manual calls it a "screen cover". The spring goes between the top of the cover, and a flat stop machined in the oil return line coming from the center bearing.
The filter screen and filter are slightly longer than the cover, thus pushing against that spring, which holds the screen and filter seated down against the bottom of the "hand hole cover", the big plate you remove to access all that stuff.When I bought my TO, I found the screen and cover were installed upside down by the prev. owner. Couldn't even get them out, had to drop the pan to get them out. Probably < 30% of the oil is actually filtered thru the filter in a given pass, since your oil is re-cycled thru the engine, it all gets filtered sooner or later. These old engines are a simpler design than modern engines so it isn't a big deal. It IS important to make sure your screen in installed correctly, your oil pump can't pass any solid particulates larger than a few thous. inch. As for the felt washers, didn't have any in my TO when I got it. Never installed any, don't know what they look like, or exactly why they are suppose do... to keep particulates from splashing in around the holes in the screen I would guess. Would like to hear from some other guys on the felt washers.
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