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What is the encoder size?

I've been having some issues when scrolling so I wanted to replace the encoder with a new one but I don't know the size of the encoder.

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crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0

crwdns2947414:01crwdne2947414:0:

what exactly do you mean by the encoder?

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