for the levers, look for the little set screw on the visible pivot, where the lever and master cylinder are connected. I think it's a 2mm hex head. this little set screw holds your lever snug. you may have lost your set screw(s), and might have to get some new ones.
for the pads, you can either buy new retention springs, or gently bend the existing ones into a wider "H" shape.
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