I'll try and get this post correct.
Those holes are essentially to zero balance the damper. The next one may have two holes or no holes.
Again, I don't skimp on dampers. An elastomer damper starts to degrade from day one, and it also has a very narrow range to control harmonics. Change the bobweight, change the frequency the damper needs to deal with.
Chrysler has a pretty good write up on this in the engine book.
