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 Hole: Approximately 10.5mm Depth of Shaft Insertion Hole: 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 structure ③ Loosening prevention with appropriate synthetic rubber for easy fine-tuning (Ver. 2) ④ Clever 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 jig, the depth adjustment of the jig bolt allows for adjustment to accommodate all club assemblies. Feature ② As shown in Image 1, tap the socket into the desired position with a hammer or similar tool from above. The durable, one-piece structure allows for stable socket installation. When actually attaching the head, adhesive is used, so I think it's a good tip to set the depth about 0.3-0.5mm 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, a clever design has been implemented to ensure smooth movement of the bolt screws. (The clever design is proprietary 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.