Cleaning keys contacts

i have a sticky key 9
i have the board out but unsure what to do next to clean the key mechanism

just realised the mechanism is fine, it must be key binding with front panel, any ideas on how to fix this, Dremel ?

Put it back together, but as you’re tightening the screws, try to shift the pcb around such that none of the button caps scrape the front panel.

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There’s also this thread: