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.