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On mine, there’s a hole under the pot on the pcb through which the adjustment tool/screw driver can turn it. This allows safe(er) adjustment so you don’t have to reach across the board like that. If the white protective plastic is in place, it covers the bottom of the pcb and blocks it. Photo...

I just ran in to this same problem with the same conclusion over the weekend. I just recapped a Mac Classic analog board, I had not powered it on before recapping, and had the "wobblyness" problem as  well, also more apparent at the top of the screen. I found schematics and started checking...