The butterfly shaft would be fairly easy to make from rod, but the diecast lug on the end would be a pain to replicate. Another way forward here would be to turn down the original shaft a little and slip some stock brass tube over it. Then make suitable bushes to fit the carby body from bearing bronze or buy these ready made to suit your brass tube stock and limit your work on the carby body to fitting the bushes. If you have one, an endmill in a drillpress (assuming there is no mill or XY table available) would be preferable to a twist drill. Alternatively, some carbs do use a plastic sleeve bush between the shaft and the body or shaft bush.
A further concern is whether the area of the body that the butterfly is in contact with is now badly worn out. Is the butterfly plate itself worn? It is meant to fit the body so it doesn't leak air past in the closed position. When trying to fit a new bush, this will be important as it will determine how well the air control works.
A further concern is whether the area of the body that the butterfly is in contact with is now badly worn out. Is the butterfly plate itself worn? It is meant to fit the body so it doesn't leak air past in the closed position. When trying to fit a new bush, this will be important as it will determine how well the air control works.
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