many ways to do it. but here is how we tend to do it. see video again and look at the XRR sling at 0:52 in the video.
XRR sling with a 28x20 ring spliced into one end. The other end is an eye. Block goes in the eye.
NOTE, take some junk small cord and close the big eye so the block does not flip around and become a problem on retrieval.
We retrieved that DMM block and XRR sling from the ground when we were done. Followed it up with a throw line to lower it.
I add a small 20mm plastic ball, BESIDE the rigging line to retrieve. It makes it through the block quite easily and the combined rope thickness and small ball catch in the 28mm large XRR.
Other ways: use a junk small metal ring instead of a plastic ball.
Other systems: Lots of them. But you could use a BEAST 38x28 ring and a block and have the beast ring as the large ring and use a large plastic ball that is maybe 28mm - 36mm, one that goes through the beast ring and get stuck in the block. It is actually easier to retrieve if you make the block as the small ring, that way the block doesn't have to flip up over wide open crotch. That way just the beast ring has to do that and it's lighter and smaller.
Or, don't use a block at all. If you have an XRR adjustable sling with the large 28x20 ring spliced on that sling, then just take a loose beast 38x28 ring and trap it in the whoopee eye and pull adjustment tight to trap the beast ring. IF your sling is the 3/4" one.
I gotta go, family bugging me, hope this reads okay because I don't have time to proof read at this time.
