I've spotted a very small leak from the top flange on our copper cylinder heating coil. I'm planning to drain the cylinder and push something in the gap this weekend. I'm just wondering if it's possible to get the coil out, or if the cylinders are welded together with it in place. If I could get it out, it would make it easier to clean the mating surfaces, but looking at it, I'd be suprised if it was possible.
Also, does anyone know what would work best? My old and well-used tub of Boss Green (which fixes most things for me), silicone sealer, Plumber's Mait, or something else?