Diagram of Dimensions for Constructing the Crossbow Stock

The width of the crossbow head is 1 inch and 7 fen A fen (分) is approximately 0.1 inches or 3.2mm.

The horizontal width of the crossbow stock at the opening for the socket hole is 2 inches

Pre-prepare the antler to be inlaid into the crossbow stock to a length of 6.2 inches. From the wooden section, it should gradually rise until the end, where it becomes 1 fen higher at the far end. The width of the crossbow face is 9 fen or 8 fen; it should not be any wider than this. The length from the head to the hole is 3 inches and 3 fen.

The Socket Hole original: tangyan (塘眼); the large aperture carved through the stock to house the bow-lathe

The distance of the binding cord from the surface is 2.5 fen thick. The horizontal width of the upper binding cord is 1 inch and 1 fen. The length of the horizontal hole is 1 inch and 8 or 9 fen. If the crossbow has great draw-strength, the length should be 2 inches. The upper width is 2 inches and 2 fen, and the lower width is 1 inch. The horizontal width of the lower binding cord is 9 fen. The inner part of the arrow groove is 1 inch and 4 fen away from the socket opening; this is called the Field Diviner original: Tianshi (田筮); likely a reference to the flat alignment area that "guides" the arrow like a divination tool.

Behind the socket hole, a small groove is carved internally to install the binding cord.

The binding cord for the Thousand-Jin reinforcement original: qianjinjiao (千斤膠); likely referring to a high-strength adhesive or a reinforced binding point intended to withstand "a thousand pounds" of pressure is 1 inch and 5 fen away from the support, and 8 fen away from the secondary point.

Leave 5 inches beyond this point.

The horizontal width of the section where the trigger mechanism is installed is 1 inch and 5 fen.

From the trigger mechanism to the string-catch, there is no bolt; there is only a "tube-channel" of approximately 5 inches. The horizontal hook is named the Pushing Mouth original: tuikou (推口). The distance from the string-catch to the outer edge is 2 inches.

The width of the crossbow stock at the hook section is 1 inch and 9 fen.

The tail is 3 inches long. The main tip is reinforced with an antler inlay.

**Technical