Put an off cut of brake cable inner+outer into it, pull tight and tape under the bars as you usually would at the end where you want it sort some way of pinching the cable so it doesn't move.
Get a tt brake cable joiner and use either lever to control the one brake.
No rattles and double the braking options.
This is a great idea didn't know such a thing existed. Can you link me to something as not sure I can find it'll the correct thing.
@dancing james started
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Put an off cut of brake cable inner+outer into it, pull tight and tape under the bars as you usually would at the end where you want it sort some way of pinching the cable so it doesn't move.