For many witnesses dear Mick, the best way to teach is to listen. They will give you all the ammo you need for one simple reply. Then repeat the process as they go through it. Simply state the fact and use their own reasoning against them with questions. “Why do you say that?” “But is that what the Bible is referring to?” Then, “Have you thought that this might be true also?” Or - the watchtowers own best friend “Have you ever wondered?” If they read it for themselves, or hear it from you, then you are winning their mind. Be positive about your work. You are there to “cause a division” anyway!
As to the remaining carts…..again, be positive. That one ‘carter’ may have gone home, thought about what you said and agreed and therefore are in the process of rethinking their understanding. I would love to go cart hunting with you!! Keep going.