i've got earthtone heads i want to install on 50's radio kings. as is, they won't even really seat due to the tight fit. i tried to grind some of the metal with a dremel as some suggested, but i guess i didn't have the right bit or enough patience. finally, i did what a few suggested: i cut through the hoop, in four equidistant places. this actually seems to work. the head fit well, and will tune up nicely. just wanted to pass that on to any with the same problem