I have been known to lie often. So you just cant trust a word I say. Even when confronted with people that have 40 years experience in knowing it all.
I say that they cause more issues than they prevent because yes they allow moisture out if it gets in. But the hole guarantees that it will get in. Vs if the set is tight to start with, it wont get in at all.
And getting it out through that singular weep hole is a little bit of a pain after the fact once the bluing job is done. And during the actual bluing process, water will leak out some from the hole which can cause issues with streaking your rusting applications and such.
After the job is done and all is dried out and oiled, it does not really matter if the hole stays open or not. But if one wants to plug it up, a piece of lead shot tapped into the hole does the job.
This is just based on my own experience in bluing barrels and dealing with weep holes in them.
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B. Dudley
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