I bought a used Ofna MBX R2 and it cam in last night. It seems as though the shocks are worn out. I dropped it on the counter from 3 inches (I measured) and it bottomed out!! This is my first buggy, so I have nothing to base it on, but I don't think thats right???? Can I rebuild the shocks, or should I replace them? I bought the buggy pretty much just for jumping and I can have it bottoming out so easily.