You don't even need to tie a knot in the end. Just use a really long piece of thread, push it in on one side and use the hoover on the other, then thread the out cable along it.
@Sumo started
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You don't even need to tie a knot in the end. Just use a really long piece of thread, push it in on one side and use the hoover on the other, then thread the out cable along it.