Mine is the HCigar KFL+ v2. Maybe you already know this, but the bottom screw is not adjustable for contact positioning like the 3.1. Unscrewing it will loosen the top block.
Edit: When the top block is loosened, like mine was when I got it, the only way to tighten it was by using a separate wrench to hold the top block in place. Otherwise, the screw just spun and did not cinch down the top block.
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