This tells me that while I'm laid up, I'm going to need to work on my version of Aussie's build.
So this isn't a wasted post, I'll illustrate with words and use this as a placeholder til I can get around to the build and taking/posting pictures - it's not a pretty sling, and doesn't look particularly traditional, but I've found 'for most ammo' it works quite well
This build may not make a lot of sense to a /complete/ newbie, and I've made various design choices through repeatedly testing what does and doesn't work 'for me personally - YMMV - also, this kind of a stream of consciousness/ going through the process post, so if it needs editing for clarity, I don't mind if one of the wiser heads tackles
For the strands, I've found great functionality from bog-standard 550 milspec paracord (length dictated by your own comfort level/aim of overall length - I go with enough to give me a meter long when the sling is folded in half) it seems to give the right resilience/wear without feeling too...bouncy or overly elastic, and I like the way the 4mm stuff feels as a balance between weight, rigidity/flexibility and durability - I might experiment one day with surf-fishing line
For the pouch, I use thin, flexible leather, a mm or two thick - 2.5cm wide by 17.75 cm long x 2 strips, ends trimmed to a 1.25cm radius. Center point of the radius I punch a hole of about 6.25mm in diameter
I assemble as follows - I stack one end of each strap, insert an appropriate sized brass grommet and set it. Adjusting the angle so the other end closes with an overlap that 'cups' the pouch (details in the following thread -
https://slinging.org/forum/YaBB.pl?num=1213024797/0#0 ) and then set the second grommet, making sure the grommet edges are smooth (otherwise it'll wear through/cut your cord)
Insert the end of one of the paracord (melt your end) and overlap towards the outside of the pouch about 1.75 cm - using a needle and the toughest embroidery thread I can find, I pierce through the paracord in an x pattern to start, then whip from about 2.5mm from the edge of the pouch up to the melted ball on the end of the folded over tail, then x pierce back through the stitched paracord a couple of times before tying off, then soak the whipping with superglue
I take the cords, stretch them out, at the end of one, I tie a bowline knot (non-tightening loop) sized for finger, two fingers or wrist (whatever you prefer) I do a generously comfortable one finger sized (I don't like self tightening)
I hold the pouch folded in the middle and stretch out the cords, with the loop on my finger, to find where to place my knot, then tie/build a triangular pad of knotwork for a release grip, it's small, but I favor a 'pinch between side of forefinger and thumb hold)
It's nothing particularly groundbreaking, but it's reliable, and if you use consistent ammo, it tends to cut down, if not eliminate some of the variables in my throws
Hope this was useful to...well...anyone
Tldr: two thin leather straps (7"x1" - 17.75cm long x 2.5cm wide, rounded off at 1.25cm radius ends, hole for grommets at centerof radius), grommetted (1/4" or 6.25mm), crossed over, with paracord
Will update with pictures when I can get round to making another one
Edit: found a sketch here on the old posts of how the pouch goes together - then I just add grommets