I guess I was thinking that the knurled part on the selector was a knob that you turn to adjust, rather than rotating the assembly on the distributor shaft. That makes more sense, now. Thanks for having patience with me on this.

1948 Chevrolet 1-Ton Grain Truck
In the Stovebolt Gallery SOLD
More pix in Photobucket

"A Man & His Truck--It's a Beautiful Thing!"

"You're never 100% ready, you're just next"....Ty Murray