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This tool has a drill bit on one side to help to remove existing earmould tubing extractor and a threading loop on the other to help insert new pre-bent tubing.
Take a look at the video for more details on how to do this.
General information on earmould tubing: Aim to replace earmould tubing approximately every 6-9 months, or when the tube becomes discoloured and hard. This will help to maintain good sound quality and comfort. If the tube becomes too hard it can snap and get stuck inside the mould.