[My3Sons!]

Anybody know the answer to this thread, lots of old threads on the topic but they seem to contradict, I have LMC kit as well and have 3 primary parts. Spring, metal contact stud and plastic ring. I've read you have to dremel down the metal contact stud for the plastic piece to fit, which seems extreme to me, also some threads mention just cutting the plastic piece. Just looking for confirmation on what should be very simple. Spring, then metal contact stud, then plastic ring around the 'head' of the contact stud to hold it at the end of the spring, yes? The part that confuses me is what is the actual trigger of the horn, I would have though it's the contact stud grounding out on the oval ring, if that's the case then what's with the plastic ring that prevents them from touching? What am I missing here.....