I have heard of it before, as a friend drives and has competed for many years in driving. My mare is a good spud and very responsive, so i have just been attaching the reins to the loop the bit goes on, cause its too long so the bit is falling out. Its off to get more holes in it in a week or so and i have got the lend of a straightbar bit so i will have a go but i think she will prefer no bit tbh. Its purely pleasure, she won't be showing. My foal will eventually show hopefully though