Ashtabula is the city in Ohio USA were virtually all these cranks were once manufactured for Schwinn.
(and many others) Above: Cleaning-up the stem-mount shifters, refurbishing one side at a time.
The extra thickness of the fillet also provides strength, and its smooth contour distributes stresses evenly.
(For additional strength Schwinn also brazed steel sleeves into the interior of its frame tubes at the joints.) Fillet-brazed bicycle frames are strong and have a neat and clean appearance, but they are uncommon because of the additional craftsmanship required.
Fillet brazing involves building up brass filler metal in a smooth "fillet" around joints.
(See illustration below) In this method of bicycle frame construction, "mitering" or cutting the tube ends so that they fit together precisely is critical so that capillary action will draw the molten filler into gaps for a strong joint.
The P12 was highlighted with Nervex lugs, a steel Stronglight Competition crankset, and Campagnolo Grand Sport front and rear derailers.
Finding our first hand everything they can about the absolute latest in cycling componentry. (In fact, their skills and knowledge are so well respected, they're even testing a line of racing shoes for a major manufacturer.) In the end, we do it all, all for a single purpose.
Then I gave it a quick coat of Turtle-Wax Chrome-Cleaner / Polish / Rust-Remover.
Above: The One-Piece "Ashtabula" Crank all cleaned up and ready for re-assembly.
Around the world, no less than ten Schwinn racing teams are doing the very same. To simply make Schwinn the premier bicycle in the world.
Some Of What In racing, it's critical for a bike to track straight.