We bought one of your sheds on Liverpool, here in Mexico City, 4 months ago.  

So far, we love the design and quality of the shed, but are concerned because the top is warping out (the sides are an inch higher than when we bought it).  The shed's sides are also becoming warped, but less notoriously.

We believe that the gas springs are too strong for the lid, so it ends warping itself up.  

We were looking to replace the gas springs for some other model, less strong that the originals, but then we saw on your site that this is a common flaw, and that you already have a solution: some kind of steel piece that we can attach to the lid and make it strong.

a) How can we get the steel piece?  Where can we find it?

b) The steel piece will stop the walls from warping outside?

c) Should we change the gas springs for some other model, with less force?  Which force have the original ones?

Hope you can help us, because we really love our shed!