A little trick I used is take some spare wire of some sort and run it thru that hole into control cavity I folded the wire an double it up so that it fills the entire channel but can still pull it thru. So that when you sand and fill if needed the debris doesn't get into the channel and you can push the wire up thru or pull it out to clear anything that makes its way into there.
Last edited by Drummerdude; 03-06-2017 at 06:34 PM.
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