HI, on the Wg monitors that I find in cabinets from the late 80's, the horizontal size adjustment is located on the chassis in a horrible spot. I need the tool that goes inside the coil to adjust the size of the screen. I TRIED USING METAL HEX or ALEN wrenches and boy do they get HOT fast, don't try this at home! Does anyone know the name of the part I'm looking for and where to buy it? Thanks for your time. GAME ON