How to Replace the Mattress for Sofa Beds | eHow.com.
Find out which type of mechanism your sofa bed is equipped with. The most. 3. Decide whether you want to upgrade the quality of your sofa bed mattress.
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When converting the mechanism from bed to sofa, this type of mattress folds over once, the carriage then drops to within the sofa and approx 20cm of mattress.