Simucube 2 Cone Clamp Help

Hello all, I purchased a Simcore Shaft extension for my Simucube 2 i was able to take out the cone clamp as per instructions problem is i cant get it to fit back into the Wheel base Shaft. Here’s a picture below

You must have a long screwdriver to put in the clamp with extension size

I’m in the same situation atm, did you manage to make the extension hub slide onto the clamp?