It's not, I promise. Millions came with no bolt. In fact, to date, I've never seen one with a bolt and that includes all the trucks I've ever seen with slant sixes. I've seen where people say some came with them and I'm sure they did, but I've never seen one. Also, I've never seen one sling the balancer off, hub and all.
Now, if you were going for a performance build, you might consider putting one in. Since all of the slant 6 cranks were threaded, that's certainly an option.
