What the thread found

• The Preston HU3 handset ships from the factory with 5 turns of drag on the focus knob
• Drag adjustment is performed by rotating an allen wrench in semicircular slots beneath a removable plate on the handset
• Increasing drag requires inserting a 2.5mm allen wrench into the top semicircular slot at the leftmost hole and rotating clockwise to move it across the slot, with each full rotation counting as one turn of drag
• Set screws embedded in the rubber focus knob must be loosened before adjusting drag and retightened after each adjustment to test the feel
• A large center Phillips head screw must be tightened firmly after reaching the desired drag level to secure the adjustment
• The adjustment process requires removing two small Phillips head screws and a plate to access the drag adjustment mechanism

Depends on

• Instructions cover only increasing drag; decreasing drag procedure not detailed in this section
• Guide is specific to Preston HU3 handset model
• The exact relationship between rotation turns and drag amount is not quantified beyond factory setting of 5 turns

Gear in this thread

HU3

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