So the DD Is the loop and the yellow is the str8? And what helped you determine which to use as the loop? I think the stronger should be looped... At least from my findings.
Toddy's string idea is genious!
LGD
If I'm not mistaken, they join the tubes straight without a loop. I guess the stronger (green) will be at the forks and the yellow at the pouch.
Judging by toddy's post in the linked thread ( post 3). It is looped, but I could be mistaken too.
Duckman, as I explained above, we are now doing this without any loops. The reference was only to illustrate the knotted string. Davesteve has it right. Give it a shot. I think the red and yellow combo sounds workable. There needs to be lots of experimenting as to combos and the right ratios to use. For example, I used equal lengths of the tubes mentioned at first and that was too soft-shooting. But once I shortened the yellow it was gangbusters, tossing the half-inch steel downrange at a real good rate.
This approach was suggested by Toddy, and I think we can all have much fun with this.