Though I have a bow press and reserve my own strings I've found it easier to use what I'd call a sacrificial serving. I made two short dowels with notched ends to wedge between the string and cables to lift the string off the rail. Then, by hand (no serving tool needed) I serve the center portion over the existing serving the width of the rail. This negates the need to removed the front end, takes only ten minutes and the original center serving lasts forever. Just thought this might help someone with a xbow that eats center servings.