[Tinbasher]

The trick is to clean all of the surfaces first and then tin them with a thin coat of 50/50 solder. This is what we use to use for rad repairs. Then clamp the side supports into place. Furniture clamps work well and then heat the area. When the tinning starts to look shiny then add solder to the edge. It will wick in between the surfaces. Let it cool and then wash with baking soda and water to neutralize the flux and then rinse with water. If your worried about heat then wrap the tanks with wet clothes. Abut 2" back from where your working. I made the rad for my 28 because the core had a 6" hole through the middle of it. It can be done just take your time and get everything clean, clean, clean. JP