On Dec 28, 2009, at 1:03 PM, BOB FREITAS wrote:
> I think these are probably SAE (domestic fine thread) I find my
> Hetchins and Hurlow both use a fine thread but of different diameters.
> 1/4 vs 5/16, these should be a standard hardware item.
> BOB FREITAS
> not selling many standard bolts today in
> SANTA ROSA, CA USA
>
I answered off list but now that Mr. Nut And Bolt has chimed in here it is. It's a Whitworth Allen (note capitals, it's a proper name) bolt. I once got a similar vintage Raleigh Pro for $50 because the guy couldn't find a seat bolt. I just went to my local English motorcycle store-actually I could have gone to my English motorcycles but I knew Casey would have one-rummaged through the Allen bolt can and came up with one. Easy peasy. Phil Brown Down memory lane in Oakland, Calif.