I just read this...was wondering if it's true. I have a bad habit of believing most of what I read.
"Actually, the minute you attach a french link to an immovable side piece like the eggbutt snaffle or a full cheek, you turn a gentle bit into a very powerful pressure bit. French links should only be used with loose ring cheek pieces that slide. Otherwise you drive the center link into the tongue and it does not release."