[Ron Ramirez]

First of all, it isn't a tuning coil - it is a tuning capacitor (also called tuning condenser).

The drive assembly mounts to the front of the tuning condenser. It is desirable that the drive shaft (the part where the tuning knob fits onto) be loose and easily turned by hand.

These illustrations, from a page on my website illustrating how to restring the dial cord on certain Philco models, should help.

[Image: http://www.philcoradio.com/tech/images/dialdiag.jpg]

Not only does this show how the string should be routed, it also shows many parts of the drive assembly.

The dial itself is riveted to the dial holder. This is held in place on the tuning condenser shaft with a set screw. Make sure that set screw has not become loose, or else your tuning condenser will slip and not tune properly.

Another view:

[Image: http://www.philcoradio.com/tech/images/sideview.jpg]

This does not show the dial holder, but does show the shaft which drives the mechanism.