Just finished the retrofit
Paddler came in with the same situation but on a WS Zephyr. Just finished the retrofit. Probably going to limit the twist range of the backband by taking a 8" x 2.5"x 0.5" of plywood plank tucked under the back strap of the two ratchets and use it as a bottom brace anchoring it into a slot cut into the seat pan where the old back rest used to nest.
http://wp.me/pFgdM-sI
See you on the water,
Marshall
The River Connection, Inc.
Hyde Park, NY
www.the-river-connection.com
hudsonriverpaddler.org