Valve actuator assembly

A butterfly valve actuator assembly, comprising:

• a platform having a first platform support and a second platform support, the first platform support having a first opening, the second platform support having a second opening;
• a stem extending through the first opening and the second opening, the stem having a first externally threaded portion and a second externally threaded portion, the first externally threaded portion and the second externally threaded portion between the first platform support and the second platform support;
• a pin nut having a body and a pin, the body having a first internally threaded portion threadingly engaged with the first externally threaded portion;
• and
• a lock nut coupled to the stem between the pin nut and the second platform support,
• the stem including a shearing portion to a side of the lock nut opposite the pin nut, the shearing portion having a reduced diameter relative to the stem on either immediately adjacent side of the shearing portion.