I've heard of using solid copper before, but IMO, it's kind of a eye sore.
I would follow Apachef1's advice and if available use the same cabling as what you're using for speaker wire.
A paper clip would work, but not if you care about sound quality.
I would follow Apachef1's advice and if available use the same cabling as what you're using for speaker wire.
A paper clip would work, but not if you care about sound quality.