YOU ARE BUYING A , BRAND NEW , ZENITH CARBURETOR FUEL MIXTURE ADJUSTING TOOL FOR THE 150CD AND 175CD CARBURETORS. THIS DOES NOT WORK ON EARLY STROMBERG CARBS THAT WERE FITTED TO TR4-A ENGINES. 

 THIS IS THE TOOL MADE TO GO DOWN INTO THE TOP OF THE CARBURETOR AND HOLD THE PISTON WHILE YOU TURN THE METERING NEEDLE TO ADJUST THE FUEL MIXTURE. 

THERE IS A SMALL HEX HEADED SCREW THAT ATTACHES TO THE FUEL MIXTURE NEEDLE AND WHEN YOU TURN IT CLOCKWISE IT RICHENS THE MIXTURE BY RAISING THE NEEDLE AWAY FROM THE FUEL JET , AND COUNTER CLOCKWISE IT LEANS OUT THE MIXTURE BY DROPING THE NEEDLE TOWARDS THE JET.

THE OUTER PART OF THE TOOL HOLDS THE PISTON SO THAT YOU DON'T TWIST THE PISTON AND TEAR THE RUBBER DIAPHRAM.

THIS TOOL IS MADE TO ADJUST THE FUEL MIXTURE ON MOST STROMBERG CARS INCLUDING

MGB 1975-1980

MG MIDGET 1975-1979

SPITFIRE 1971-1980

TRIUMPH GT6 68-73

TRIUMPH STAGS

TR7 AND TR8 CARS WITH CARBS 1975-1980  NOT THE LATER FUEL INJECTED ONES

JAGUAR XKE WITH STROMBERG CARBS

LOTUS

JENSEN HEALEY

XJ6 AND XJ12 CARS WITH STROMBERG CARBURETORS

MANY MORE BRITISH CARS AS WELL THAT THE FUEL MIXTURE IS ADJUSTED THROUGH THE TOP VS THE BOTTOM LIKE ON TR4-A CARS