With a traditional loop, there are times when the gap between the thread strands can cause problems, especially with hard-to-manage stuff like marabou, moose body hair, etc. Even with a good coating of wax, it's not easy to keep the material where you want it until the loop is spun and the fibers are locked in.

(Uni-stretch used here for clarity)






You can twist the strands together and tie them down to close the gap, but that adds time and extra wraps.





A little different approach here eliminates the space and makes it easier to hold the stuff in place pre-rotation.




instead of going over the top of the shank, take the thread underneath, right next to the "outbound" leg




come up and over from the back side (now you're tying like Charlie Craven)




go behind the loop




then over the top; the loop is locked in place and the gap is pretty much eliminated






Regards,
Scott