I suggest anyone who installs wet-bolts to pump some grease through each one before installation. I say this because I slathered everything with grease and then assembled the shackles. I didn't bother to grease it with a gun at that point because it just wasn't necessary.
Then a year later I tried to grease it with my grease gun and it wouldn't go through because half of the bolts I got from eTrailer were not drilled all the way through.
Since it was a year later they of course, would not replace them for free.