Audio Cable Beam Mount
thingiverse
This fits a RadioShack auto cable perfectly. My output end is actually slightly larger than average, which means it might just work for your setup. You've got two options for securing this thing: use some double-sided sticky tape or a set of zip ties specifically designed to fit 30mm beams. And just so you know, I did add my signature to those zip-ties in case that was causing any anxiety.
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