3D,
No, I never did a FM video. At one time, "onesharp..." did a good one, don't know if it is still linked here.
There are two ways to use the FM to learn to feel BT. First, set it up so the cord fastened to the bow string is slightly shorter than the tips of you fingers. Then when you draw (without an arrow) just let your sting hand "float" beside the bow string and come to full draw. This forces you to draw with your elbow which by definition forces the use of back muscles and takes the biceps out of it. Do this for a while and you will start to get the feel.
Once you get this, then adjust the FM to about an inch or two LONGER than the tips of your fingers. This time, draw with your fingers on the string (as normal) but be sure to keep the feel you learned in the first step. (use an arrow this time). Come to Full draw, anchor, and release. IF you have your BT correct, when you release, the arrow will fly only a few feet but when the slack in the FM cord reaches the end of its travel it will try to pull your elbow forward. If you have the correct setup in your draw, the strap will not move the elbow forward. If you have collapsed or lost BT when you release, the FM will pull your elbow forward Indicating a form flaw.
The FM is not recommended for higher weight hunting bows (over 50# I believe). It is best to start the FM work with as light a bow as you can put your hands on! Learning the FM process is not a strength test and is best learned with a very light bow , once you have that, you can progress to heavier draw weights.
Arne