Has anyone had an expander bolt that when fully tightened (I.e. bottomed out) didn't expand enough to grab /hold the tube?
I'm installing a Shimano/PRO Di2 battery holder / expander bolt and I can't reach the 7 nm tightening torque. As I tighten the bolt, the expander ring starts to expand and then stops when it reaches the bottom. Any more torque causes the expander to spin in the tube.
The expander is designed for 1 1/8 steer tube, which my bike is. Is it possible that the wall thickness on my steer tube is a fraction of a millimeter thinner than other bikes.? It's a steel tube so is it possible that this expander bolt was designed for carbon steer tubes that have thicker wall thicknesses?