they are very easy to obtain. Any car mechanic that has a brake lathe. They end up with the metal shavings that they just dump! You certainly can expect to get asked what you will be using them for though!
It has the lights on top of the posts that will flicker with sound and light from underneath as well. I am trying now to sort out a way to puch a heavy electrifying sound. I need a big sound with a small device