We made a few crank locks this morning. To enable locking the crank at #1 TDC. With the hopes that it will hold it at TDC during balancer install and final torquing. The outer holes register on the bell housing dowels. I'm not real keen on the crank locks that grab a ring gear tooth and with the aftermarket balancers having degree marks etched into them it will also make checking lifter preload very quick and negate the need to install a degree wheel.