I also do it like Bluey and Aces N Eights. The burlap has never left a mark on my horses, though they have not actually fought the restraint. As mentioned, mostly lifting a foot, feeling the length they can reach, settling leg back into place. I do not go to the leather hobbles, since they always seem too small for my horses wide chests. Leather actually pulls lower legs tighter together than they would stand normally, which I think could be painful. Using the burlap piece, I can size the hobbles to the width I want between front legs, no pull on the upper legs at all.
I always start the hobbles on the cannon bones. All the illustrations on “How to teach your horse to hobble” had the hobbles up on the cannon bones. So following those directions, my first horse learned to hobble as I read the article!
If horse does some pawing, reaching, the hobbles may slide down to pasterns, but I have had no problems with either location. I NEVER let horses “fight it out” with hobbles. They try them to see how much room they get, then they stand and wait as directed by the word Whoa as I leave them. None have offered to fight or run, just act puzzled, then accepting of the restraint. They are well educated young horses, willing to cooperate, know what Whoa means.
Teaching to hobble and wait when restrained has saved several of my horses from getting badly damaged when snagged in downed fences, vines on a trail ride. Some evidently had stood there entangled for a long time with only minor injury or no injury at all. We had to go find them, didn’t come up with the other horses.
Well worth the effort to teach a horse this skill. He may need it later in life, as mine did.