[Woodcarver] Split mandrel help?

[Vic & Cynthia Hamburger]

For the power carvers out there.......

I have some tapered sanding points that have a hollow center with a bit 
of sandpaper crossing the center of the hole.  This would seem to need a 
split mandrel that fits the size of the hole and the paper slips into 
the slot on the mandrel.  Once power is applied, it locks together to 
sand without slipping.

My question is, how do you slide the split mandrel into the hole and get 
the sandpaper flap inside to slip into the slot?  I have some 120 grit 
sanding points that don't want to slip into the split for me.  I haven't 
tried finer grits, but am guessing they will be equally challenging.

Thanks!

Vic H