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I took another measurement with an inner diameter measuring tool, so it's more precise. . Also, this time I tightened the bolt and the nut with a wrench tight (but not the required final torque) The big end comes up being 39 mm, short end 14.85, and distance 94.2 mm.
Although not measured with micrometer, I'd say these are pretty accurate. So, according to this, the final updated distance you asked about would calculate to 121.125 mm. I'd suggest the true distance is probably 121 mm. If Alex asked 'is this your final answer', I'd say 'yes!' LOL