Eyelet sizing tool for a needle/armature rotation limiting feature of a fuel injector

A tool for forming an armature guide eyelet, the armature guide eyelet being disposed in a solenoid actuated fuel injector, the tool comprising:

• a body having a first end and a second end disposed along a longitudinal axis;
• at least one sizing rib disposed on an imaginary circle that surrounds the longitudinal axis, the at least on sizing rib having a first potion and a second portion, the first portion having a constant radius from the longitudinal axis, the second potion having a sector cutting a section of the imaginary circle at two points, the sector tangent to the imaginary circle and parallel to the longitudinal axis.

A method of forming an armature guide eyelet to be used in a solenoid actuated fuel injector, the armature guide eyelet being supported in a fixture, the method comprising;

• aligning at least one non-uniform sizing rib and an armature guide eyelet having a constant inner diameter along a longitudinal axis;
• and
• forming the constant inner diameter of the armature guide eyelet into a non-uniform inner diameter with the at least one non-uniform sizing rib.