[Ron Ramirez]

On those filter caps, I usually drill a small hole in the metal stud its self. It is easier than drilling the Bakelite.

Oh, I do as well. But please go back and examine the photos again. The Solar cap is constructed differently from an original stud mounting electrolytic - the entire base, including the threads, is Bakelite. So it called for some rethinking since I did not have another original type stud mounting electrolytic (with insulating washers) in my stash o' stuff.

And if you mean the aluminum rivets that hold the solder terminals in place (upon rethinking, I suspect this is what you meant), I don't have a drill press so I can't always drill through those rivets without causing trouble. My method worked, though - that's all that matters to me.