BALL TOOL & BONE TOOL - You can use them to make round indentations. It's good to have a few different sizes. For example:
- 4 mm (or similar size)
- 7 mm (or similar size)
- 10 mm (or similar size)
If you don't have the proper size ball tool, use a smaller one and enlarge the indentation by making circular moves with the tool inside the indentation.