Cheap ball pan head

I didn't know at the beginning why this item is sold at such a cheap price and I found out a critical defect finally, lack of tapping depth of 1/4 fixing hole, so the bottom surface does not touch on the fixing surface keeping 1 mm thickness. This item must be a defective product hit by inspection! As for my luck, I'm keeping 1/4 middle tap, the clogged problem was thoroughly solved immediately! But for this special tool, no one could mend it. Tapping tool and drilling tip with pilot hole 5.1 mm were prepared for survival of Dolphin AR-VT tripod that had been in stuck because of missing part. Rough finishing ball surface carries unfavorable movement like getting caught, so smoothing rubbing procedure applying Microflon powder attained the destination, comfortable movement like KAMBO CBH-2. Smooth movement while adjusting and tight fixation while shooting are the requirements.