Have you tried reversing the sprocket? Not sure if it works, and it won't help the GDP, but if it does you've just saved yourself the £200 you were about to drop on a pair of Phils.
@gbj_tester started
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Have you tried reversing the sprocket? Not sure if it works, and it won't help the GDP, but if it does you've just saved yourself the £200 you were about to drop on a pair of Phils.