At first, It' needed to set up for assembling.
I use 2 folding working bench. To the top of tires, a rectangular is tied.
Then bottom of tires are on a line.
Like this. it's nice setting.
The distance of centers of tires should be setted at 1290 mm.
The pivot angle is setted 67 degrees. Because Original pythons has the degrees.
I only have a portable gas torch. It is impossible to be soften the crank with such torch. the crank does have a incision to bend it easily.
Then, with strong shaft, it was bended to fit to middle rectangular and front part.
It looks perfect, However it was needed to check the angle by assembling it.
Then the incision was widen to weld.
Done. Next to bore 2 holes for screws which the diameter is 8 mm.
The edge of middle rectangular was cut with same angle of BBS to be parallel.
Marking the position for boring, then they are bored with the drill which diameter is 6mm. Adjusting their position, they are widen to about 8 mm with round file.
More one assembling, then marked a position on the bended crank. Then bored with center drill and 8 mm drill.
2 tubes were made from seat stay to support the middle rectangular from the inside. The length is quite same to inside of middle rectangular which is about 36.5 mm. They aren't welded.
More one assembling to mark to cut upper crank and this time, lower crank were screwed with some washers to keep the from of middle rectangular.
Then it was cutted. By repeating assembling and grinding a little and a little, at last it has exact angle, then
Welded and grinded.
Fine.
