Peter Laidlercan clue you in for the finer points, but I've done two front pads on my own rifles (with some major assistance from Brian Dick
who had new screws and Burrell Sullivan who does much better solder work than I.)
Rear pad is likely fine!
You will need new screws, as the old ones fail under shear after the solder fails.
Usually, breaking the screw haed loose from the stake mark just requires a little extra torque on the driver bit, but it's possible a little reverse staking or micro "Dremel" work could be needed.
You may be able to use the old stake with the new screw, but if the pad hasn't been staked too many times before, just align it with the new screw slot.
Some l42a1 repair photos coming- "hold, please..."
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Note the joggled shank of the screws on the right-NFG- No farging good! New ones are a must, even if they don't look this bad.
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Be sure to thoroughly clean the old solder from the pad and body- and check for a close fit between the two. The better the fit and the cleaner the surfaces, the less likely your drama will recur.
(I have also dowel pinned one, but only because it wears a huge Gen 1 night vision device fairly regularly.)