You could try to purchase an "Octal saver" which is an adapter that would raise the height of the socket. Not sure how deep Cary's sockets are so you might not be able to easily retrieve the adapter once you put it in place. Good luck.
http://www.vacuumtubesinc.com/Products/SocketsAdaptersParts/AdaptersandParts.aspx
http://www.vacuumtubesinc.com/Products/SocketsAdaptersParts/AdaptersandParts.aspx