Ronald -
I asked several months ago, and Reynolds will produce the tubes again with a minimum order of 200 pieces. I am not sure of the metallurgical specifics, as once I found out it was such a large piece order I lost interest.
For those of you interested in this frame design, try and make it to the cicli polito booth at NAHBS next month. I'll be displaying a frame made of NOS 531, including a curved tube that came from JT himself by way of a pal. It's a little tribute to NT . . .
You can see the frame, unpainted, on the maple bench in this workshop shot:
http://farm2.static.flickr.com/
Can't wait to get that one back from paint! Dan Polito
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cicli polito
1433 east 33rd st
down rear
cleveland ohio 44114
440 263 1263
ciclipolito.com