I used a screw to hold the roof supports until I got the lag bolts in, these are 5/16 x 4. I drilled a pocket with a 7/8" bit, then followed with a 17/64" pilot the same depth as the bolt, then a 5/16" hole through the 2x. I think this is a lot better than nails, and it has to be stronger than 3 screws.

 

 

 

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