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Looking for a hand throttle. Current one is toast.

Is it just the chrome or is it that it won't move?

The one on my car was rusted stuck. Soak the heck out of it with PB Blaster or other good penetrator. I held it upright and dribbled penetrator down from the top so it could drip down inside, and left it upright over night. Repeated a couple times over a few days and it broke free. Then work it in and out with more penetrator until in moves mostly freely.

You just want to get as much of penetrator down inside as you can.

Thanks BK. Yes. It is frozen Stuck. Will give it a good dose of magic juice and see what happens.

Stay tuned!

If you have a shallow container such as a cake or pie pan to hold some fluid or solvent, coiling the cable gently so as not to cause a kink but in a small enough circle to fit in the pan holding fluid might also help speed things up. The gentle coil of the cable will tend to open spaces in the outer wire wrap so fluid can get inside more freely and reach the moving wire.

I had a throttle cable for one of my small engines that had seized up.

Hit it with a propane torch and heated up the shell, being careful not to go to far and damage the handle, then juiced it with ATF/Acetone while it was still good and warm. That got it loose. Then I weighted it down on the concrete with a couple of bricks and pressure washed it at close range. Got a metric crap-ton of rust out of the inside of the shell. Then soaked it again; haven't had any issues with it ten years later. It lives outside, undercover.

I had to get mine from Max Merritt as the car came with one I think was off a lawn mower! However I did something similar as tsherry with the parking brake cables. I tapped the casing up and down lightly with a hammer to break the rust lock. Once I got them to move some I hooked the end up to a variable speed drill and slowly turned the wire inside the casing, make sure you use lots of lubricant, and turn in the direction of any winding if applicable (my throttle wire is a simple wire but yours may be a fine cable so be aware).
Holding the casing in a vise, (gently as to not crush/distort it, just enough that it holds unmovable).By slowly turning the wire and adding spray lube and moving the wire back and forth in the casing full smooth action was restored, and I too had a bench full of rust and dirt. Very satisfying!
I used fine sand paper on the wire as I got it to protrude out of both ends of the casing too, to further allow smooth action and applied white grease like the speedometer cable.
A plater can restore the nickel finish too if you like. Nice to have as much original equipment as possible on these old girls.

Flackmaster was kind enough to dig into his archives and send me his last one!!!

It looks brand new and now I need to make sure the rest of the knobs on the dash meet this standard. Off to the chrome plater!