[TR] control head "roller" ?

[Gary Nafziger]

Took apart the control head (tr-3)...........re-assembled............... and
now can't make the lever stay ON when moved to the right or left.  (when moved
to right or left it flies back to center).
 Should there be a "roller" or
spring loaded "ball" on the lower end of the turn signal lever?  I notice
there is a square hole in the bottom of the lever which holds a spring and I
also have a square shaped piece of brass that slides inside the square hole
and over the spring.  The tip of this square shaped brass piece has a cross
cut depression which looks as it should hold something.................
I
might have lost?

thanks

gary n.