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In your pic it looks like the 'leg' is not in the full up position. Don't try to rotate the cover an additional 1/4 turn because the cover can't fit over the roll pins that way and a 1/2 turn will damage the spring.
You can tell if the spring is already damaged by removing the spring from the cover and look at it. If it is out of round, it has been damaged - BUT CAN OFTEN BE REPAIRED.
Using a couple pair of pliers, bend the spring back to being round. If the top wind of the spring is just a little larger circle, that's OK because when you assemble it, the spring hole in the "leg" will keep the spring where it needs to be (inside the machined groove of the cover). Hope that helps.
Thanks for the advice. I've been busy with other projects, so not had a chance to disassemble the pegs. You are correct that the support bars are not in the full up position, I'm pretty sure they are hitting a roll pin, so I have them assembled improperly.
I will post back when I find the time to take them apart.