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Gather materials for Mod. 1a+b

1/2 sheet of 3/4"x4'x8' OSB (other 1/2 will be used for Mod. 1b)

1/2 sheet of 1/2"x4'x8' plywood (other 1/2 will be used for Mod. 1b)

~16: 3-1/8" construction screw

~16: 1-5/8" coated deck screw