[QUOTE=SuckerForHorses;8405535]
Dragging up an old thread so please forgive me.
I’ve always “known” leverage bits to require a curb chain, and this bit is a type of leverage bit.
Are there instances where it should (could?) be used with a curb chain, or is this a leverage bit that should never be used with a curb chain?[/QUOTE]
“Leverage” requires a fulcrum (typically the mouthpiece) and a lever (the “arm” of the bit).
In a (straight) Pelham WITHOUT a curb chain, when you pull on the rein you exert pressure on the poll ( by pulling on the cheekpieces).
In a (straight) pelham WITH a curb chain, when you pull on the rein, you exert pressure on the poll, AND you pinch the lower jaw between the bit and the curb chain. Which effect happens first, and/or which is stronger, depends on the length of the cheek pieces, and the length of the curb chain.
If you have a jointed bit, a curb chain is pretty much useless. As you pull on the reins, the bit bends at the joint, and the curb chain gets LOOSER.