Due to the concerns of a poster that we may not have the basics if we haven’t read the German “The Principles of Riding”, I decided to re-read my book obtained in the 80s.
Now it states in the book that “The bridle is correctly fitted when the bit lies high enough to touch the corners of the mouth without pulling them up”. It also states that a thicker bit is a kinder bit but I find that horses with a small mouth prefer a smaller thinner bit.
I first learned to ride in “hunterland” and was taught that there should be two wrinkles on each side of the corner of the mouth. That the horse should look like he is smiling not laughing.
Once I started with a dressage trainer she lowered the bit. The following week my jumper trainer would raise the bit. This continued so I finally just used two different bridles.
What is the consensus how the bit should be fitted. I was using a loose ring french link but plan to switch to a D ring french link as my horse tends to have a busy mouth and my horse has two wrinkles.