Reference: CMP seat back coil spring dimensions

[Phil Waterman]

Hi David and Grant


David good simple approach I've got a fish scale, so I measure how much the springs stretch on my HUP when siting and leaning back then remove one and measure its pull strength at that pull length.


Grant that is quite a good instruction sheet you posted, looking at the instruction sheet an idea hit me wonder what the pull strength on screen door springs is per inch of spring length? Or would that be to simple a solution?


Will take photos as I explore this problem. One of my problems is that my Pattern 12 Driver seat doesn't recline as far as the passenger so it is hitting me high on the back instead of the length of the back. Probably will have to drive out the pivot point rivets and get it to move freely.


Cheers Phil