Rigidity of a futon bed mattress is more important when the futon is being used mainly as a sofa. Flexibility basically defines how easy folding the futon mattress is going to be. If you are going to folding the mattress daily from sofa to bed back to sofa again, then buying a futon bed mattress with a lot of flexibility makes sense. Futon bed mattresses are made from a variety of materials.
The hinges were attached to the arms of the futon frames with two bolts and two nuts. While this design was OK the hinges themselves would fail when too much weight was applied to one side or the other. These would also bend out rendering them useless in the operation of the futon. Most specialty futon retailers pay little to no attention to black metal futon frames. Retailers Ive spoken to have said that the black metal futon frame is the number one service headache when it came to futons with over 95% of service issues being the failure of a black metal frame component.
The other issue with the hollow bars is that if enough weight was placed on a spot they would begin to bend. The issue became so bad that a 90 day warranty was put in place by most manufacturers of these frames. Another issue the black metal frames suffered from were bending stretcher bars or rails. Again the hollow nature of these strecther rails presented issues with breakage and bending.
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