Lighted nock

A lighted nock comprising:

• a light emitting unit including a light and a cylindrical battery, wherein the light is turned on or off by moving the light toward the battery or away from the battery;
• a shaft adaptor which includes a cylindrical structure so that an outer surface is inserted into a rear end of a shaft, wherein the shaft adapter comprises a proximal end and a distal end opposite the proximal end, wherein a slot is defined in the shaft adapter beginning at the distal end and extending in a direction of the proximal end, in which at least a portion of the light emitting unit is inserted through the proximal end into an inner space of the shaft adaptor;
• a fastener secured to the shaft adapter in a location that causes a width of the slot to narrow and lock at least a portion of the light emitting unit to the shaft adapter;
• and
• a light operator, comprising a first end and an opposing second end, wherein the first end of the light operator is inserted in the proximal end of the shaft adaptor, while a lower portion of the light operator receives the light,
• wherein the light is turned on or off by moving the light operator toward or away from the shaft adaptor, and
• wherein the light operator includes a raised first registration feature and the shaft adaptor includes a recessed second registration feature that is complimentary to the raised first registration feature such that the light operator cannot rotate relative to the shaft adaptor when the light operator is moved toward or away from the shaft adaptor.