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Only a bit of electrical tape around the top of the lever and under the hood to stop it from moving, I did the biro trick in the past and it was great until someone decides to test your brake and ruin all the hard work. The bit that the cable ferrule sits in inside the lever has a bit of a rattle going on, if I can hear it clearly enough over the noise of lorries and buses on my commute then I'll jam some blu-tack in there to shut it up.
Done anything about the rattling on the left lever?