Best for fine tuning rather than using an allen key. Cheap generic adjusters - https://www.ebay.co.uk/itm/PAIR-M6-6mm-Brake-Cable-Barrel-Adjuster-Bolt-Screw-Nut-Cycle-Adjusters/300966718240?epid=1488243029&hash=item461303ab20:g:MOcAAOSwUlFaqWHm
Don't know why I didn't think to look on ebay.. Thanks for that
@BigH started
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Best for fine tuning rather than using an allen key. Cheap generic adjusters - https://www.ebay.co.uk/itm/PAIR-M6-6mm-Brake-Cable-Barrel-Adjuster-Bolt-Screw-Nut-Cycle-Adjusters/300966718240?epid=1488243029&hash=item461303ab20:g:MOcAAOSwUlFaqWHm