After fixing a leaking power-valve, I now need to re-adjust my Ford truck’s idle mixture screws, located at the base of the carburetor. The screws are a straight slot on the head, not a Phillips. It’s a very frustrating job b/c of the slotted screw head and their location. The distributor and fuel filter are both in the way. A long screwdriver doesn’t meet the screw dead-on b/c of the distributor, but allows me to see what I’m doing. A short screwdriver clears the distributor so it meets the screw dead on, but my hand is in the way then so I can’t see what I’m doing. In either case the screwdriver keeps slipping out of the slot as I turn the screw.
I got to thinking there must be a better way. My current idea is to wrap a short screwdriver with some elastic bands near the tip, then friction fit a piece of tubing over the end of the screwdriver, the tubing (copper, plastic, not sure?) just a little bigger than the head of the screw. Then – at least in theory – the screwdriver will be forced to stay on the head of the screw by the tubing. Any easier or more likely to work ideas out there in Car Talk Forum land?
Edit: Forgot to ask another related question. I’m thinking of using on old O2 sensor – which I think still works – to assist. My idea, I’ll shove the sensor as far into the tailpipe as I can, and read the voltage it produces while I’m adjusting the idle mixture screws. I’ll start with a rich mixture so there should be no O2 coming out the tailpipe, then adjust in the lean direction, and stop adjusting when the O2 signal just appears. What do you think? One problem I can think of, the O2 sensor may need to have the outside part out of the exhaust stream to work properly.