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I'd be quite careful - there's not going to be much metal engagement with a hex key, be OK to stop it wobbling but I wouldn't try and torque it up. Better to get the right bit.a normal allen key will fit and tighten that . make sure its a good fit ,it doesn't need to push on all the star points. other than that you need to go buy a set from screwfix or similar,always handy to have.
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