Making the plates larger would just make the problem worse.
And once the extension dovetail is damaged they really cannot be repaired well enough for them to function as designed. Then things have to be modified.
In the ones I have fixed, the plates are perfectly fine, the extension metal just blows apart.
I think that the only proactive solution to the issue would be maybe to replace the screw with one that has a head on it and actually holds the plate back against the slot. The existing screw only keeps it from pulling up out of the slot.
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B. Dudley
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