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the plans of these frames are my own, but you may have it if you wish...they were drawn mainly for myself, I'm amateur draughtsman...https://ti1ca.com/9b71r5kg-tombereau-OCEM-29-tombereau-OCEM_29.pdf.html
I’m not so happy with the result, they doesn’t fit well with my "all mechanical" frames, but I don’t have no other solution for making these parts