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The bmw locking pin might seem optional but I assure you it's not, its precision machined to lock the damper in place with nearly zero tolerance, substitutes are not acceptable for something like timing, people say it's "optional" but that's only to hold the engine in place while you bolt something in place to keep it from turning (which it is also used for), but not when setting timing and the engine needs to be in the exact right spot to start with and in the exact same spot after the first revolution.
The bmw pin has such a tolerance that you will "miss" the lock and have to go around again several times sometimes.
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