Might the tripod solution and the retention of the bolts by washer and nappy pins be fundamentally a bad design? Why does an office chair have five legs and why circlips have been invented being more resistant to axial forces and to wear by vibrations? A Cotter Pin 'Fokkernadel' is not constructed to transfer larger forces and the washer is like a punching tool.
Please see https://www.yumpu.com/xx/document/vi.../fokker-nadeln
Last edited by AW009; 10th May 2016 at 18:45.