Farmall Cub

where can i buy just a throttle shaft or a pin to fix mine ...

How about a little more information about what problems you are having? Even a photo might help. Maybe there's an alternative to replacing the shaft.

where the linkage mounts it spins on the butterfly shaft

For individual parts...

http://www.mcdonaldcarb.com

The throttle shaft comes in most rebuild kits, but I have never heard of one of them spinning on the shaft. the choke linkage yes, but never the throttle linkage. Depending on whether it is IH or Zenith, some of the members may have a used one from a junked carb. Note, the throttle shaft is the one immediately below the mounting flange. The choke is the one closest to the air inlet.

John its an IH carb . There is a tiny pin of some sort that holds it on the shaft that little pin fell out of mine don't know where that why i was looking for just the shaft .. I had rebuilt the carb last year and didnt get a new shaft ...

Roll pin. Hardware store or nearest tractor dealership.

Should be an easy fix. Checked my stash of carburetors on the shelf. First one I picked up, non IH carb, the lever was attached to the shaft with a small roll pin.

I, too, have never seen a Cub IH carburetor throttle shaft with a pin in it. Every one that I have seen or worked with had a square end on the brass shaft that fit into a square hole on the governor linkage plate. Then the brass shaft is peened to lock into the hole. Sometimes that joint can get a little loose. But, it is impossible for it to spin unless the brass shaft is severely worn. You may have something home-brewed or not original to the carb. Can you post a photo?

i will try to get a pic but i fixed it and put it back on the tractor for know with a rollpin

Glad it's working properly for you.

bubble gum fixes everything