I was a theme park ride technician for 10 years and have found these type of rides are generally a very poor quality build I have often question the mechanical integrity of the rides & lap bar locking systems. In many cases the manufactures are contracting componentry to china and is of very poor quality and standard which keeps the purchase price lower and would suggest seat belts should be fitted to every ride in australia regardless of standard and quality of build. The seat belts can be retro fitted and engineered into the ride at a price , but what price do we put on a human life for the sake of a seat belt that may have prevented a death. I have found with lap bar locking systems there are usually 2 or more devices that lock to ensure in some saftey factors, I have also seen both of these fail but not at one time,again cheaply made rubbish I dont trust them. I have also had experience with the government agencies they send people out to inspect rides with little experience the whole industry needs a complete overhaul. Although dreamworld and warners I have no issues with as they do maintain high saftey standards as I have had back of house maintenance tours.