Wow.. I just made one very much like this and tried it out.  It worked wonderfully, chucking large acorn sized rocks a hundred yards with ease.  I made it small deliberately for rocks that size.  I used a piece of cotton cord and made my standard "Appu-sling" then covered it with medical tape per the instructions.  It's so easy and effective... great stuff for a fast sling when you need one. 

Rat Man

Woonilsra wrote on Apr 21^st, 2009 at 8:11pm:


Think of tying the normal bowline knot that will make a loop on the end of a cord.

Now think of the step where you bring the end of the cord around to make the knot around the twisted bight. Now, use the end of a different piece of cord instead. This gives you two lengths of cord tied together with a free end from the knot running in parallel.

Now flip the whole thing around and do it again, using the other length to twist the bight and the short length coming from the first knot to tie around the bight.