For locking flywheel in TDC position on BMW N51, N52, N52K, N53, N54.
* Turns crankshaft to TDC position while central bolt moves.
* Put HCB-A1188-3 into calibrate hole (arrow ahead) and fixed crankshaft.
1. There is a big hole make use of TDC position nearby calibrate hole.
2. When HCB-A1188-3 stayed in calibrate hole and locked flywheel, it is impossible to move engine through central bolt.