Hmm, Aluminum (or some other material with a high melting point) for the mechanical connection to the board would explain a lot, wouldn't it? Since the function generator works well now, I don't want to open it up and remove the display board again. If it ain't broke, don't fix it... I don't believe the mechanical connection got even a little tacky at the highest possible iron setting. As I mentioned, when I covered it with molten 60/40 solder at 899 degrees, the solders didn't appear to mix. I wicked away the 60/40, and the same blob was left as before. I with I'd taken photos, but I didn't.