the one or more apertures 436 when the clam shell housing is assembled to the ratchet head and motor subassembly 400 referring to fig5 one or more semi annular ribs 536 in a first clamshell housing portion 516 are shaped to fit into and substantially fill the one or more apertures 436 for example the semi annular ribs 536 prevent the motor end plate 426 from rotating out of the slot 432 in the ratchet head housing 412 fig6 is a process flow diagram illustrating a process 600 for assembling a motorized hand tool according to an aspect of the present application as shown the process 600 begins and proceeds to step 602 which includes aligning a semi annular flange portion of a motor end plate with an aperture in a ratchet head assembly in step 604 the process includes passing a motor end plate into the ratchet head assembly after aligning the semi annular flange portion in step 606 the process includes moving the semi annular flange portion out of the aperture and into a peripheral slot of the ratchet head assembly by rotating the motor end plate in step 608 the process includes obstructing rotation of the motor end plate from the peripheral slot according to an aspect of the present application an inwardly protruding rib portion of a clamshell housing may be aligned with the aperture the rib portion may be placed.