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If you are looking for a battery cover for the old Pioneer power meter (owned by Shimano) but can't seem to find them anywhere, this might be your only option. It is domed so that you can use a 6 mm allen key to install and not a coin. In order to use this you will need to remove the o-ring from the original cover (or purchase a new one 22 mm OD x 20 mm ID x 1 mm). The cover will work without the o-ring, without it the seal will not be as snug.