Thanks Del...I have never seen this Before...got a Question though...have you ever had a String fail from being wrapped in this while working on a Bow? Looks like it could cause the String to fail where it bends sharply...or am I just worrying for nothing??
Thanks for sharing
Yes you are worrying about nothing (
don't you have a wife for that? 
)
It's an old rather overbuilt string from a heavyish longbow (I think), but all the strain on a string is when it's shot, it wouldn't fail during tillering.
I have actually shot with the string like that, but not at full draw, I just couldn't resist it

.
The wooden toggle thingy could possibly damage the limb if it was shot at full draw.
The holes are well smoothed and rounded.
I use it a lot and it saves on lots of effort.
Del