Can any one tell me how the oil flows thru the canister. I took mine apart today because no oil is coming out of the return line. After cleaning it i can't find any obvious return ports in the main tube that the return line screws into. It appears that once the canister cover is put back on, there is no way for the oil to get to the return line. The return line actually came off while the engine was running and no oil was flowing out of it. Any thoughts?