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TR2/3/3A Choke cable detent

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On my TR6 I actually removed the small detent ball that's inside the cabin heat cable. This ball drops into groves that are cut into the cable end to give it the detent function.
Have you checked to see if the ball is still there? Are you sure that a PO didn't replace the cable with one that doesn't have the detent feature?
I can only assume that it works the same way on your model.
 
On some of them, there is a small brass plate instead of a ball. Find some flat brass and file to shape.
 
On my TR3A (replacement cable from TRF) the detent is a little flat bit of metal, sort of a skinny semi-circular piece -- like a skinny letter D. They get lost when someone pull the cable all the way out there is nothing to hold them in place. I made a replacement that worked but I knew what the missing one looked like.
 
I lost mine when I took the cable apart for cleaning. I had to study it for an hour to figure out that I lost the little plate, and had to guess what it had to look like to fit right. Like Randall states, I took a piece of 1/4" brass brazing rod, filed half...or a bit more...off, and then sliced 1/16" of that off the end. I wound up with a crescent piece of brass, about 1/16" thick, and about 1/3 of a full circle. With a bit of precision filing, it fit in the choke coil and worked.

Not trusting my craftsmanship...I ordered a replacement choke cable. 3 years later the make shift piece of brass is still going strong. I may end up using the "new" choke assembly in the TR2.
 
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