I wish I hadnt deleted pics, but until I got some whoppies, I used the following method:
Sewed a loop in one end of the webbing.
Wrap around tree and pass free end through said loop.
Snug the free end up to the tree.
Take the free end of the webbing, and where ever I want to clip my carabiner,
Simply make a marlinspike hitch, and where the toggle would normally go, clip the carabiner in.
When you are ready to go, just remove the carabiner from the loop, and pull the free end of webbing, and voila! the knot dissolves itself. This is also usefull for quick adjustments.