I bought used aftermarket shocks for my 90cc eton and they are wore out but not leaking fluid. Who in northeast ohio rebuilds them? I donot see a name brand (works/elka) on them.. How can I tell what brand they are? What kind of price for a rebuild should I expect? Are these shocks nitrogen charged ??? they have a shrader valve on them. How much pressure should be in them? Can I add nitrogen and get by for the January 7th race?