Here is the Loctite brand. I'm sure there are many others out there. A 12 ounce jug goes a long way on small detailed stuff especially if you get some of the scale off beforehand. I think these jugs run between 4 & 6 dollars. On the patch panel, maybe a inch or two relief cut in that bottom corner and a little heat will get it in there nicely. Then you may be able to weld your relief cut rather than an additional piece. Just a thought. Have a good one.