Since the Bullet has almost 0 flare, I doubt it was the drilling. You may not be thinking about it because the Bullet needs so much dry to make the turn but it does need oil to clear the heads. Some oil, any oil; because it's resin so it DOES need oil.
You might have need to go inside the 4th arrow to find that oil, or it might have been so dry, so fried you needed pearlized urethane or even plastic. Can't tell from this distance.
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"...for advice is a dangerous gift, even from the wise to the wise...."
J. R. R. Tolkien