I have a mess on my hands trying to restore the brake fluid reservoir on my 1948 6C 2500SS Touring coupe. I have to disassemble the unit in order to install the fluid level piston assembly inside. Everything came apart surprisingly well except for the fitting that threads into the bottom of the can. It looks like a formed thread similar to that on a light bulb. Lots of area to stick. After trying conventional ways of trying remove this stuck thread I am baffled. The can is very thin, fragile and hard to grip. Does anyone have any experience with this problem? Does anyone have a spare unit I could buy/trade for?