Favorite Saying.... "It's ALL About the Brass Roller"..... And "Use MASKING TAPE" for board skipping in the X or breaking bits.
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I have noticed that the head will rock back and forth a little as the board goes in and out from under the rollers. If someone, for some unknown reason, carves without staying under the rollers, the "roller lines" in the carving could be more pronounced without the red lock as opposed to with the red lock. (I never use it either.)