I worked on mine recently. What you described sounds right. In addition there is a second fitting on the bottom for the flared short metal line to the rubber hoses. You need two open end wrenches on the bottom to completely disassemble it. The washer on the inside of mine had a ring of red rubber (silicone?) to seal with. I took mine apart to apply a gas/
oil resistant sealer at all unions and connections. I also took ERAChase's suggestion of double clamping the hose connections wiith the screw clamps 180 deg apart. Only the clutch can is filled on my car right now but it's dry.
So you have options. You can loosen the clamp on the hose and remove the entire thing from the hose up - break loose the flared line connection underneath and remove the eintire can assembly - or as you apparently did, remove the inside nut on the bottom of the can and remove it from the line and connection. If my hose line connections were good and dry, I think I would use two wrenches on the bottom to loosen the flared union joint and remove the can from the line.
I also bought the rubber inside seals to install in the lids. Works very well - should help prevent leaks at the lids. I think this was Patrick's trick he published here.
Good luck Frank