In reply to chickenpox:
yes I have them set up right and the flat side of the ball goes against the rock. I still find for the best placements try and fit the flat side of the ball in to a bit of rock in can't get back out of (like a dimple).
The problems with ballnuts are:
- often in traditional nut slots if you wiggle the device it easily walks along the crack to the wider part and becomes unsafe.
- in perfectly parallel cracks they may hold for an aid placement but may not for a fall.
That's why I use them in placements the ball part fits in to.
Stevo