Randomly stumbled onto this... Nice build. What sort of weight is it being hi-ten?
If you're referring to the 501 framed Corsa it is not Hi Ten.
The 501 tubeset is slightly different from 531 but it is Chrome Molybdenum with a high Manganese content. It is also double butted.
If you are referring to the other then I am unable to comment.
Co-founder of a V-CC section, member South Eastern Road Club and owner of - 2005 Bianchi Reparto Corse (modern), 1985 Raleigh SBDU Pro Super, 1984 Raleigh LU Corsa, 1980 Allin Stan Butler Special, 1978 Ron Cooper, 1975 Bill Philbrook tourer, 2 x very early Roberts (mid/late 1960s), 1966 Raleigh Superbe Roadster, 1964 Allin Stan Butler Special Belgique, 1951 Hobbs of Barbican S/C, 1950 Hobbs of Barbican S/C, 1947 Hetchins Super Special, 1908 Centaur Featherweight. 1988 Specialized Stumpjumper.