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[quote user="BaltACD"]So - what would non-negligent maintenance look like? Applying torque to each lag screw fastener to a specified value and see that the lag screw doesn't run away because of a broken shaft or stripped threads in the wood or lag screw. That is a lot of fasteners to be tested on a periodic basis.[/quote] Perhaps negligent maintenance is the wrong word. Nevertheless the defects weren't found during maintenance. To find a broken lag screw you don't need torque. It still can be laborious. Look at the end of the Canadian report. If I understood correctly the lag screws in the ribbed plate don't use spring washers. One way from my point of view would be to use spring washers. With a broken screw the head would sit about 0.5'' higher. Regards, Volker
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