Early Spark and Throttle Rods

[Original Smith]

If you have a Ford manufactured prior to 1916, be sure to use a jamb nut for the adjustable ends. I just ran across one from one of my cars, where the throttle adjustment is barely holding on.

[Rich P. Bingham]

Larry, any idea what size and thread pitch they are ? As I recall, they’re an oddball size. Mine are “wiggly” too !

[Ron Patterson]

If I correctly understand the terminology in Larry's original post? If not ignore this!
Attached is a photo of an original Ford spark and throttle rod end swivel (depicted at right) AND reproduction rod end swivel (at left).
The male and female ends threaded ends on the original Ford item are 12-32. You can find this same thread on the ignition coil four point mounting bolt and nut hardware. Not uncomon to me
The reproduction swivels (depicted at left) (which are currently available) are 10-32 thread on both male and female ends can be found on the coil point gap spring adjuster/lock nut bolt . Some can be found with a hole on the male end for a cotter key.

[Rich P. Bingham]

Perfect ! Thank you much, Ron ! Much appreciated.

[Allan]

The jam nut is only needed to stop the threads on the rod and in the linkage from "working". The rods cannot turn, nor can the linkage on the end. If you are about to lose one, it was never threaded on deep enough, or the rod has been loose enough that the wear has allowed the thread to jump a few turns. The jam nut does keep the linkage set at the desirable angle for optimal operation.

Allan from down under.

[Original Smith]

Thanks for posting the correct thread size! I couldn't find tap or a die in my stash!