The reason I'm showing this is to show how I used it to cut the holes for my dash.
Here's the dash before mods.
[IMG][/IMG]
Her's the layout I came up with for the new gauges.
[IMG][/IMG]
The center hole is 5/16" to fit the stud on the previous pic. The other hole is 1/2", and
is located at the exact edge of the circle. The 1/2" hole slips over the nibbler head, and
is pressed tight toward the center, and the slide is locked down.
Rich