Speaking of taking things apart that you wish you hadn't.... Have any of you ever run across a mid-60's Square D panel with spring loaded clip/clamps on the panel as opposed to screw holes in the box case?

What a hassle!! I found my first one last week and it took me about 20 minutes to put the cover back together. Clips, springs and screws.... all that have to be lined up precisely and then delicately slid into place, held there and screws tightened, all without knocking one of the six loose.

I guess I can see why the design never took off