Guide holders for engaging a motherboard sled with an input-output sled stacked thereon

An electronic chassis comprising:

• a motherboard sled configured to be stacked under an input-output sled having a handle rotatable between an unsecured position and a secured position, the motherboard sled comprising:
• a housing having a first sidewall and a second sidewall opposite to the first sidewall;
• a first guide holder coupled to the first sidewall, the first guide holder having a first plurality of slots and a first additional slot, wherein, as the handle is rotated to the secured position, the first plurality of slots are configured to direct motion of a first plurality of guide pins on a first side bar of the handle in a predetermined direction and a first additional slot configured to direct motion of a first additional guide pin on the first side bar of the handle, wherein, when the first plurality of guide pins and the first additional guide pin are engaged with the first plurality of slots and the first additional slot, respectively, the horizontal distance between the first plurality of guide pins and the first additional guide pin decreases as the first plurality of guide pins rotate beyond horizontally parallel relative to the first additional guide pin and toward the secured position;
• and
• a second guide holder coupled to the second sidewall, the second guide holder having a second plurality of slots and a second additional slot, wherein, as the handle is rotated to the secured position, the second plurality of slots are configured to direct motion of a second plurality of guide pins on a second side bar of the handle in the predetermined direction and a second additional slot configured to direct motion of a second additional guide pin on the second side bar of the handle, wherein, when the second plurality of guide pins and the second additional guide pin are engaged with the second plurality of slots and the second additional slot, respectively, the horizontal distance between the second plurality of guide pins and the second additional guide pin decreases as the second plurality of guide pins rotate beyond horizontally parallel relative to the second additional guide pin and toward the secured position;
• wherein the motion of the first plurality of guide pins and the first additional guide pin, upon completion, lock a first edge of the input-output sled to the first sidewall of the motherboard sled, and wherein the motion of the second plurality of guide pins and the second additional guide pin, upon completion, lock a second edge of the input-output sled to the second sidewall of the motherboard sled.