Steve Knight wrote in message . . Any other idea's?

Maybe a wheelchair back support (I have one on my TT since it has no
lumbar support). It has the wrap-around belt for adjusting.

I swear by bunjee straps. Maybe several of those small ones from
almost any hardwae strore would help! Like -wwwwwwww

Or Zip Ties?

Chris Jordan
Santa Cruz, CA.