Hi guys - under the heading of you never quite know what you've got until you tear them down... One of the HS6 carbs for the TR4A is missing the spring shown below. It goes in between the nut and the body/face of the arm that controls the movement of the jet.
As installed;
With bolt loosened;
By itself. Sorry - slightly blurry standalone shot;
As installed;
With bolt loosened;
By itself. Sorry - slightly blurry standalone shot;