This is the exploded diagram that ships with the Mola Softlights, on how to setup your mola from shipment.
This compression method uses the pressure of the black compression ring to hold the speedring in place against the back of the soft light. If the speedring turns, use the added black rubber o-ring to stop it doing so.
The spacers should be setup to allow at least an inch gap between the strobes flash head and the deflector (PAD / OPAL) to allow adequate heat to escape. Different lengths of the spacers are included for the different brands of strobe that a user may want to use with the mola. (see here if you want to stack your central deflectors)
This mounting hardware is available separately should you lose your existing hardware.
Click image to see bigger / print off.