I was looking at the pictures of tethers and the prices are crazy. Most of them look like tubular webbing with elastic run in the middle to take up length so they don't droop and drag and trip you up.
Basically dog leashes with snap hooks on each end.
I get supplies for pet stuff
here, at Strapworks.com and the quality is excellent and the prices are very fair.
Tubular webbing runs .40 a foot and elastic is around .25 a foot so for around .65 a foot you can get the materials to make your tether in what ever lengths and colour you want. Splurge and make a few that can be used in different places for exact length.
Snap hooks or carabiners can be had for 1 to 3 dollars a pop so figure the ends are the bigest investment.
A 3' tether would cost around 5.00 plus a bit of
shipping for material.
They even sell a stitcher awl for 10.00, but you can easily sew on this material with a home
sewing machine. I would use Poly thread, a heavy weight for buttonholes or jeans.
Cut the webbing to the length desired, add 6" for the foldover at the end (3" for each end) Cut with a sharp pair of shears.
Cut your elastic (if you choose to use it) to the length you want the tether to hang while it has NO tension on it. Run a large
safety pin thru the end of the elastic. Slide the pin into the open end or the webbing. Push the
fabric down the pin, holding the pin at the base and pushing the
fabric on at the
head, the way you would feed a curtain rod thru the pocket of a curtain. When the webbing is bunched up hold the
head of the pin and smooth the excess webbing down over the elastic. Continue until the pin comes out the other end.
Remove the pin from the elastic and use it to pin it to the webbing, about 3" inside the tubing from the end, so it doesn't slip back thru. Make sure you have kept ahold of the other end so it hasn't worked it's way up into the webbing. Pin it about 3" from the end as well.
You should now have a length of gathered up webbing with elastic running thru it. Using a candle sear the cut ends just enough to melt the fibers to prevent fraying. Feed the ends thru the hook. Bring around 2.5" of webbing thru the hook and fold over. You should only have elastic in ONE layer of the webbing. You don't want the elastic to pass the the hook. Having it in sides both would be bulky and not add to the strength of the piece in any appreciable way.
At this point you may machine stitch or hand stitch the two layers of webbing together at each end. I would use a box pattern with an "X" in the middle, as is commonly found of strapping. This distributes the load where the pull is and gives you back up if stitching gives way in one direction. Take a look at a dog leash or back pack for examples.
Once you have the materials in hand it will only take you a few minutes to complete the
project. Threading the elastic will take the most time but I bet one of these could be completed by a rank
novice in under 20 minutes.