Crossover Help Needed With ANOTHER Pair of ALTECS

[voice of the theater]

I might be missing something here. I personally can't see any ground lugs in the photo. All of the common rivets are probably not current paths. Maybe a photo of the opposite side of the crossover board would help?

In the mod 19 there are four ground lugs. Each of the ground lugs is riveted to the board and has a wire soldered to it. (the current path is through the lugs) Connecting these four lugs together with a common wire eliminates any resistance due to oxidation between the ground lug and the board. You can also use deoxit as some have mentioned or you can physically tweak the lug to make a clean connection as long as it's not loosely connected to the board. Then measure for any resistance.

I have no idea if they are just common rivets or if they are ground connections. Here are two photos of the other side of the board and the original photo of the board for comparison. I can tell you that there is what appears to be a "circle of solder" (again, please excuse my excessively technical terminology!) on the green side of the board that corresponds EXACTLY with EVERY ONE of the seven rivets on the flip side of the board. Do these photos help to determine if the common rivets are part of the current path (ground) and whether or not it is therefore advisable to connect the rivets with wire? (CLICK ON IMAGE TO DOUBLE PHOTO SIZE)