I recently picked up an early 70s flatback 8x10. It's everything I expected: great to play, terrible to move, you know the drill. The one thing is: the speakers are just screwed into the baffle. A few screws are missing (so each speaker has 7-8 holding it in), a few feel like the holes are getting stripped, and a few are at crooked angles so I can't really tighten them down. I've got a suspicion the drivers are slowly loosening themselves as I play (a bunch were super loose when I got the cab) and I want to get them secured. Off the top of my head, I'd either drill 4 holes per speaker, put in t-nuts, and bolt them in drill 4 holes per speaker, put in t-nuts, and clamp them down with those external bracket things same as #2 but just screw the brackets into the baffle I should add that I don't care about keeping the cab in original condition (it's already been stripped and truck bed liner-ed, has burly wheels on one side, and very well-mounted Ampeg folding handles -- I actually bet it's passed through Talkbass hands at one point). I'm also not planning on swapping speakers around unless I have to recone or replace one of these old 10s. What's gonna be the best way to keep this thing running for another 35+ years?