Liquidlogic have upgraded the system used to fasten the seat into their kayaks. The Double Down seat system as it is known is also available as an aftermarket upgrade.

Liquidlogic - Double Down Seat System

The system essentially replaced the single bolt hardware used to fasten each seat pillar to the kayak with a double bolt system.

The following video from Liquidlogic shows the gear in detail and also give instructions on how it should be fitted.