I had been meaning to do this some day, but this thread prompted me to order the parts
I finally got around to installing
I went with 45# springs based on previous posts.
I ended up having to install some hinges to allow them to work
then with only one spring in place I found that it's too much
The mattress weight will hold mine down, but only barely. Lift the mattress and the hatch comes up!
I had a 20# spring that I took off my entrance door because it didn't dampen the opening stroke. (so I'm not sure if it's still 20#)
I tried it..... too long to fully close the way I have my brackets, but I would say that a single 20# isn't quite enough. I would say a single 30# spring would be about right..... in my case anyway (short queen size bed with a hatch about half of the mattress)
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