buy a 15mm spanner of your choice, drill 2 holes in it (of the right diameter and distance). Attach to bottle mounts. Then work out how you'd like to store the allen key
@fruitbat started
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buy a 15mm spanner of your choice, drill 2 holes in it (of the right diameter and distance). Attach to bottle mounts.
Then work out how you'd like to store the allen key