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I'm wondering if there's a way to upgrade the X300 seat. I have a bad back and a lot of roots to mow over. I saw a post where someone put double springs on each side under the seat and I tried that but it didn't make much difference. I put a pad on the seat and that helped but was far more unstable.
Is there any kind of shock absorber seat for that size tractor like the bigger ones and the commercial mowers have? Or is there something else I could do?

you need to get a suspension seat or at least a suspension kit if you can't afford one or don't want to change your current seat.