Wood clothes pins on the gas line

[Henry's Lady's Man]

My take, for what it's worth, y'all, is the wet cloth (with anything to hold it, be it clothes pins or zip-ties) will work the best. Evaporative cooling is an undeniable effect, and you want to lower the fuel line's temp below gassing/bubbling). Aluminum is a great heat-sink too and could be combined with the wet cloth. But some of the other stuff is like playing "telephone". The truth has been diluted and distorted by being passed down over 85 years. Stick to science, and the "nuts and bolts" will do the magic.