My local bike shop sold me an original stronglight crank puller but it is missing the inner bolt that pushes the crank arm off. At the hardware the 10mm bolts were too small and the 12mm bolts seemed to large. The 12mm goes in a turn or so and stops. Maybe the wrong thread pitch? I tried course, fine, and extra fine thread in the 12 mm with no luck.

Does anyone have an original stronglight puller (23.3mm version) that can stick a caliper on the inner bolt and tell me what size it is and what thread pitch if possible? Hopefully this is something I can find available locally if I can figure out what size it is.

Thanks1