I open up the worn throttle/choke shaft bores by line boring/reaming upper and lower housings to oversize, install upper and lower bronze bushings with an interference fit, then final size the ID to accept a new throttle shaft. You need only send the carb body. I cannot do this with the carb assembled, so save yourself some money and take it apart before you send it. There will be a surcharge for disassembly and I will NOT reassemble it without new gaskets and seals.