New to the forum, but I have made my own backrests for my Wave after cancelling a 2 year back-order from the dealer, and thought I'd share with anyone still interested.
Not having seen a set IRL, I relied on web images and some general dimensions found on this forum to design them.
I altered the stock endcaps and filled them with casting resin to receive 1-5/8" aluminum scaffolding tubes. I then used commercially available fittings and a few homemade items vs. having tubes bent. I implemented a suggestion from a similar post on this forum, and made mine adjust like a lounge chair. They adjust from 0 to 45 degrees. Also used large urethane pipe insulation for pads and had a local upholstery shop make Sunbrella covers. All told I've got @$600 and about 8 hours of work invested (not including design time).
I've used the backrests for a full season and believe they function equal to, or better than, the discontinued originals.
The tubing/fitting source I contacted precut the tubes to order (reducing shipping costs and labor), leaving just some minor fabrication and a few holes to drill and tap.
I'd be more than willing to provide his contact info, along with an order sheet and detailed instructions of everything needed to replicate my effort.
I'll post a link when I get some suitable images uploaded.
