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Little bubble almost like a foam can sometimes be seen at the sides of guide feed tunnel but they should never be huge. In reality , if you wait just about 20 minuts and hit those spots with a flame lightly , you can get virtually all the bubbles out of that area too.
Someone screwed up on the rod you described and forgot to go back and fix the bubbles that come from the air trapped in the tunnel that work their way out as it spins for a few minutes.
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