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5.
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Make the middle of the table and seats steadfast.
The middle of the tabletop and the seats will need to be made steadfast (member fixed to member) to stop wrapping and creating an uneven tabletop or seat.
One way of doing this is to drill a 10mm (3/8") hole width ways through the center of all the tabletop and seat members and by running a 10mm (3/8") threaded rod through all the holes. Nuts and washers can then be added to each end of each rod and tightened as needed. The nuts and washers will need to be counter-sunk into the lumber, any excess rod will need to be cut off with a hacksaw
and packers or spacers will need to be placed between each member.
The packers or spacers can be either washers or thin strips of lumber with holes drilled in them. (see picture).
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