May not be what you are referring to, Bob, but here are a couple of threads showing reconing.
http://www.antiqueradios.com/forums/...3e19facc1743b6
http://www.antiqueradios.com/forums/...a01afa0dae0e75
And here are some sources for cones.
http://www.electronix.com/speakersho...c-362_369.html
https://taweber.powweb.com/parts.htm
http://www.matelectronics.com/cgi-bi...&ACTION=Search
If anyone has any other sources for reconing parts, please advise. It is getting harder to find them, especially in the 4-6" sizes. A lot of the cones you see for sale have rubber surrounds as seen in modern speakers mostly used in sealed baffles. Open back radios work better with stiffer cones afforded by the corrugation of the same cone material around the outer edge. Weber offers some of these. Where you still have a good voice coil, often a commerical cone can be trimmed at the apex to fit and be glued to the old VC/spider assembly.