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Another idea to consider.
Try an inflatable lumbar support.  My cadillac has one using a pneumatic
pump.  But you could buy a blood pressure arm band and modify it as
appropriate and insert the balloon into your seat back and inflate it with
the squeeze bulb.  Might be someting to consider as a deluxe model.  Of
course you could make a crescent external foam lumbar support and add it
between your back and the seat or velcro that support to the inside of your
flying jacket.  A cheap fix.
Some ideas to consider.

Bob Smiley

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Please send your photos and drawings to marvkaye@olsusa.com.