Which tool would be used to hold a flywheel stationary during repairs?

A flywheel holder is specifically designed to secure the flywheel in place during engine repairs. This tool is essential when performing tasks that require the flywheel to remain stationary, such as removing or installing the flywheel itself, changing the ignition timing, or replacing associated components. By providing a solid grip on the flywheel, the holder allows the technician to apply the necessary torque without risking movement that could lead to damage or inaccurate adjustments.

In contrast, the other tools listed serve very different purposes. Carburetor cleaner is used for cleaning the carburetor and removing deposits but does not provide any structural support for components like the flywheel. A cylinder leak down gauge is employed to check the sealing integrity of the engine's cylinders and can help diagnose internal issues but is not designed to hold parts in place. A compression gauge measures the compression pressure in the engine's cylinders, which is useful for assessing engine health but does not assist in physically securing components during maintenance.