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The springs may have sagged some, but most likely the foam is also smashed down. You can try to use a piece of indoor/outdoor carpet or jute etc to build up the foam and compensate for either of these issues, but inserting it between the foam and springs.
I agree it is most likely the foam. Not that big of a deal if your good with hog ring pliers. Depending on how much you want to spend you can pick up a kit to rebuild the foam from LMC.
Hey thanks guys, I just checked LMC, and they have the foam kit for $35, not bad at all. Does anyone know if it's a specific foam, or could I find something similar locally? I am in kind of a hurry, I'll be traveling cross country in a couple weeks, and want some cushion on my rear end.
Like TexasGuy001 said, try checking the BOTTOM of the foam where it meets the springs. Many times the springs (thin parallel wire on two inch spacing, if I remeber correctly) will cut into the foam. A piece of carpet or someting similar between the foam and springs will fix the sag and it won't cost a cent. It's quicker and cheaper!