These two methods apply the same stringing principles. The difference lies in the length required for the tennis string which is either separated into two parts or not.
The 1-piece or 2-piece stringing method is decided at the beginning of the stringing service.
if you have chosen to use hybrid tennis strings, you must automatically use a 2-piece stringing method as you will have 2 halves of a complete set of tennis strings.
The 1-piece method may only apply when stringing with a full set of strings.
2 Knots VS 4 Knots
When a tennis racquet is strung using the 1-piece method, only 2 knots are needed to complete the string installation. 1 knot is tied at the start of the process in order to secure the string to the frame of the tennis racquet and the 2nd knot is tied at the very end of the process once all the vertical and horizontal lines are weaved.
The 2 knot method divides the set of tennis strings into to 2 parts and 2 processes therefore 4 knots are tied.
Stringing with 2 knots is the basic traditional way. It is slightly faster and much more common. This is much more practiced by stringers and easier for the amateur stringer. It is much simpler to tie 2 knots than 4.
As decribed in the 1-piece method, the 2-piece method simply does the same job twice as the vertical strings and horizontal strings are done in 2 parts.
The 4-knot stringing method allows you to have different tension on the mains and the crosses. It also allows you to install a different type of string on each the vertical strings and horizontal strings which can provide a great blend between control and power.
Tennis Stringing Terms
The vertical strings that flow from the top of the racquet frame to the bottom are commonly referred to as "Mains" of Main Strings.
The Horizontal strings weaved accross from left to right of the racquet frame are known as the "Crosses" or Cross Strings.