So, I needed to turn on the headlights on my 'new' '66, and the plastic stock knob pulled off the stem.
I thought the old knobs were kinda yoo-gly anyway, so I set out to give the dash a knob job.
First, I wanted a nice set of knobs, nothing garish or too bizarre. What I found was a classic 'milk bottle' design at Home Depot. A bonus was they are brushed aluminum. Solid, as well.
I gauged the shaft of the headlight switch bayonet, and decided a 1/4-20 tap would work. I drilled the knob out to the appropriate size, and ran a tap into it.
The bayonet is triangular, so I used a bit of Lock-Tite to insure it stayed on.
Now, the windshield wiper/washer knob was the oddball. It has a button inside the knob that activates the washer. So, I repeated the above process. The shaft of the assembly is round, so no Lock-tite was necessary.
I drilled completely through the new knob with the bit used for the tapping process. This centered the hole in the knob. Then I chose an appropriate sized bit to hog out the knob so my chubby fingers could actually press the washer button.
A little trial and error got me the correct depth...
