Cambo Wide question about re-attaching spring back. Help please...

I recently sold a Cambo Wide 650 and the recipient removed the back. He's now having trouble getting it back on, as he dis-engaged the two spring arms. Since I never took the back off the camera when I had it, can anyone out there try to clearly explain have to reinstall it properly. I have other Graflok-type backs here but I'm not sure if the spring arms engage identically on the Cambo.

The new owner is not nearby, so I can't simply go over and fix it. I know I could do it if it were in front of me, but I am having trouble articulating instructions to him.

Help appreciated!!