Original MS Sculpt keyboard

[Windows 11]

I love my old MS Sculpt ergo keyboard. But the letter "g" is misbehaving: it goes from working normally to only working by pressing hard, then pressing many times and then, finally, not working at all! When that happens I take the top and bottom of the keyboard apart, slide a microfibre-wrapped credit card both beneath and between the two metal sheets immediately underneath where the "g" key sits, vacuum the area and then put everything back together again. Then the " g" works for a few weeks, days (or, sometimes, hours) before declining and packing up again. Any ideas on how I could do so

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