Either combine enough staplers that, when simultaneously stapling them, the result of the "k-ch, k" produces a percussive pitch of "A", or, simply use one stapler that happens to be a model, size, etc. that when stapling, alone, produces the pitch "A", and you have an association between the note/pitch "A" and "stapler". (Pitch does exist within "non-pitched" percussion.)
Anti-assoc. to stapler:
noodle
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