Here is a step-by-step guide to remove the top bolt on the starter:
1. Park your car on a level surface and apply the parking brake
2. Open the hood of your car
3. Locate the starter. It is located near the oil filter on the driver's side of the engine
4. Identify the top bolt on the starter. It is located at the top of the starter, near the back
5. Use a 13mm socket and ratchet to loosen and remove the top bolt
6. Be careful not to drop the bolt into the engine bay
7. Once the top bolt is removed, you can remove the starter by sliding it out of its housing
8. Be careful not to damage the starter or any other components while removing it
9. Inspect the starter for damage or wear and replace it if necessary
10. Reinstall the starter in the reverse order of removal
11. Tighten the top bolt and the two starter nuts until they are snug
12. Reinstall the heat riser.
That's it! You have now successfully removed the top bolt on the starter of your 1973 VW Super Beetle.