[mikethedruid]

Bruce, I use PB Blaster to break free rust. It is a powerful penetrating lubricant that breaks down rust and will allow you to free these pieces without damaging either the mounts or the shields or the tubes inside. Be careful spraying it, don't spray it directly onto the radio, it might go where you don't want it and cause problems. Instead spray it into a little cup and use a brush to apply it just to the bases of the shields where they are inserted into the base clips. Hope this helps.