Originally Posted by fietsbob

Steel, as a one off, is able to be built with a relatively simple set of production fixtures .

Main triangle, of regular DF bikes it's how carefully you do the Miters .

spent a couple days as the guest of a respected hand builder in Nottingham, on a Bike tour.
he did a lot of his work with wood blocks in the bench vise to hold the tubes
and half round hand files, to cut the miters..