I have very very easy access to where the problems are. The seam on top is open, so I can solder that shut, but the hole I put in is accessible from the center easily.. I wasn't sure if I should pinch the edges of the hole closed, then solder, or if I should just solder on another small piece of tin over it so fluid can still flow in that little area. I'm assuming the solder will hold up to the pressure?