> I'm curious why they didn't use fishing line considering it's much lighter. They do: "In the launcher pictured above a Tennis Ball is propelled by compresse

> I'm curious why they didn't use fishing line considering it's much lighter. They do: "In the launcher pictured above a Tennis Ball is propelled by compressed air, towing a fishing line over the tree." I don't know where you would even get a wire made out of lead. Sounds like that would need to be ordered/made specially. The only place they mention "lead" is in the context of a lead sinker being attached to the fishing wire. And they reject that approach as not safe enough compared to theirs which is a tennis ball attached to the fishing line.