Welcome to the forum! It is great to have someone with that expertise here. I have some questions.
1. If someone were to buy a horse with an unknown history, a horse that had already been started under saddle but just had an unknown history, what bit would you recommend trying first, and why?
2. How can a rider tell if a bit is bothering a horse? I mean, let's say the horse is acting up or acting like it is uncomfortable, what would I look for that would tell me "this bit is not working," as opposed to saddle fit is bad, horse is in general pain, etc?