If a piece of plastic gives you confidence behind the plate, more power to you. Confidence in your protection is key to being relaxed, and doing your job. If it works for you, that's great.
Thanks guys for the comments. At the time I thought I did the right thing, but I started wondering later if I should have gone further (for example, simply ejected the coach for threatening the other coaches).
Experience is a good teacher, but it also helps to share these experiences with others and get feedback.
I want to issue a preemptive warning on this topic, only because the nature of the topic is one where many people will have an opinion and nothing that will be said here will change peoples minds when it comes to unions. So lets just make sure we remain civil, keep the topic on above name calling and the like. Remember we are all on the same team.