This is a socket installation tool for inserting sockets into shafts and installing them in the correct position when assembling or reshafting golf clubs. Product Specifications: Material: Steel plating Length: Approximately 82mm minimum to 124mm maximum Outer Diameter: Approximately 21.4mm Weight: Approximately 177g Inner Diameter of Shaft Insertion Opening: Approximately 10.5mm Depth of Shaft Insertion Opening: Adjustable from approximately 15mm minimum to 57mm maximum Loosening Prevention: Synthetic rubber This product is my original development with four features: ① Compatible with various shaft specifications with just one tool ② Stable installation with a durable, one-piece construction ③ Loosening prevention with appropriate synthetic rubber for easy fine-tuning (Ver. 2) ④ Ingenious design for smooth screw movement Feature ① Applicable to both steel and carbon shafts for all club types, from drivers to wedges. The socket installation depth varies depending on the head, but is generally around 25mm to 40mm. With this single jig, the adjustable depth of the jig bolt allows for adjustment to accommodate all club assemblies. Feature ② As shown in Image 1, the socket is driven into the designated position by tapping with a hammer or similar tool from above. The durable, one-piece construction allows for stable socket installation. When actually attaching the head, adhesive is used, so I think a good tip is to set the depth about 0.3 to 0.5mm shallower. Feature ③ As shown in Image 6, synthetic rubber is inserted to prevent screw loosening. From my experience, synthetic rubber with a flat contact area provides stable tightening (round O-rings are not suitable). Synthetic rubber has a higher loosening prevention effect than spring washers and is easy to fine-tune. Feature ④ To make depth adjustment easier, the bolt screws are designed for smooth movement. (The ingenuity is a trade secret and not disclosed.) For socket installation methods, the craftsman's work on YouTube channels like "How to Make Golf Clubs" and "Today's Reshafting" is a good reference. ※ Many people have purchased this product, and I have used it without any problems, but please use it at your own risk. ※ Please read the profile section.