Great question! Using a stick worm on a shaky head rig can be very effective under certain conditions. Based on the video context provided, here are some insights:

1. Subtle Action: Stick worms, like the straight-tailed worms mentioned in the videos, provide a subtle action that can be very appealing to bass, especially in tough conditions. The shaky head rig allows the worm to stand up off the bottom and move enticingly with every twitch of the rod.

2. Finesse Technique: The shaky head rig is often considered a finesse technique, ideal for clear water or pressured fish. Stick worms, being less bulky and more streamlined, fit perfectly into this finesse approach. They can generate bites when other, more aggressive presentations fail.

3. Versatility: Stick worms are versatile and can be used in various situations. They can be effective in both shallow and deep water, around cover, and in open water. The videos mention the importance of the worm's buoyancy, which helps it stand up and move naturally on the shaky head rig.

4. Hook Size and Rigging: As noted in the videos, the hook size and type of shaky head are crucial. For stick worms, a 3/0 or 4/0 hook is typically appropriate. Ensure the worm is rigged straight to maintain its natural action. The screw lock feature mentioned in the videos can help keep the worm securely in place.

5. Conditions: Stick worms on a shaky head rig are particularly effective in clear water, during post-frontal conditions, or when the fish are finicky. The subtle action can entice bites when fish are less aggressive.

To sum up, using a stick worm on a shaky head rig is appropriate when you need a subtle, finesse presentation to entice bites from wary or pressured bass. Make sure to choose the right hook size and rig the worm properly to maximize its effectiveness.

If you have any more specific questions or need further details, feel free to ask! Happy fishing!