We are at the last stages of restoring a B14 and while assembling the mower and getting it running I found out that the mixture screw is somehow loose and there is no spring to keep it in place. Result: from vibrations of the engine it comes out of the carburettor. From drawings of the car there is no clear indication if there is a spring there at all. The 20 13 carb which I have from a Qualcast CPS35 has a bigger screw with a spring. Could someone tell me that it should have a spring or not??
As a workaround I used 542 to keep it in place at the moment.