Any Bird Feeder Setup Specialists Around?

I hope this question is okay, if not, just let me know...

Although it doesn't show it, in my Bird on a Rope in the Capture By
Man forum, the bird is on a rope that is connected to two trees. On
the rope are the feeders.

I nailed two large hooks into my trees and tied the rope to both ends.
But when I attach my two feeders, the rope droops cause of the weight.

The place I was at where I saw this looked like it use some sort of clamp
which could adjust the tension. It wraps around the whole tree.

I've tried contacting (Holden Arboretum) a few people, but so far silence.

Anyone have any ideas on what this contraption might be?

Thanks
Doug

I don't know about the clamp, but it seems to me that any tensioning device like those used on guy wires and such would work.

I'd try a camping store.

Thanks Jim.

What I ended up doing is there's a clothesline kit that
attaches from tree to tree (or post to post). Uses pulleys,
hooks and a line tension.

So far its been working pretty good.

Doug

You could also probably rig a tensioner used to keep gates square to do the job.