07923-ZA00100 Crankshaft Holder - Overview. The 07923-ZA00100 Crankshaft Holder is a specialized tool designed to support Honda marine engine systems by securely holding the crankshaft in place during maintenance or repair. This tool prevents the crankshaft from rotating unintentionally, which is essential for precise work on critical engine components. By ensuring the crankshaft remains stationary, it supports reliable and safe engine servicing, maintaining optimal performance and durability..