The seat "bridges" came about because the traditional dowel posts allowed the seats to sway when one paddled a canoe. There are different length "legs" on the bridges to allow the builder to install each pair so that the seat is mounted in a horizontal plane.
They are of red cedar, 7/8" thick, partially sanded and with oversize holes predrilled.
They are designed to work with the width of our seats and may not suit other seat manufacturers.
1) Seat suspension bridges for a canoe
2) Bridges of red cedar
3) Bridges at bow seat
4) A most interesting canoe trip!