Boom Clamp

• In the past I have used an external clamp but found this to be a lot lighter and easier to make. All the commercial ones I've seen that have this also have 2 so I may have to add another if this lets the boom slip. (hasn't as yet) A long nut is welded to the tube then both split down the centre. The thread on one side is then drilled out.

• Using a car exhaust bracket. The main boom is cut as an + at the end to give it enough 'give' so it will clamp onto the front adjustable tube and an exhaust clamp used to hold it tight. On some pipes there is a joining ridge up the center and this can be taken advantage of to stop the tubes rotating. A similar size groove is ground into the mating tube so it will only slide in and out. I ground mine at a slight angle to fix the tubes tighter. The front section is slid in at a slight angle (where the groove and ride meet) and when the right distance is reached, it's rotated straight which almost locks it solid. This makes for a solid mount as there is quite a lot of stress here when pedaling.

• See Sandiway Fong's Festina Low Racer: Part 2
  
  
• Boom slip and rotation

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Thursday, 29 January 2009