A method of assembling a power head of a hand-held surgical instrument comprising:providing a power head having a housing enabling access to an interior volume of the power head encompassed by the housingmounting a set of operating components of the power head on a chassis such that the set of operating components have a proper configuration for alignment in at least two orthogonal planes when the chassis and the set of components mounted thereon are deployed within the interior volume encompassed by the housing anddeploying the set of operating components mounted on the chassis within the interior volume encompassed by the housingwherein mounting the set of operating components on the chassis occurs outside of the housing and prior to deploying the set of operating components mounted on the chassis within the interior volume, andwherein deploying the set of operating components mounted on the chassis within the interior volume provides the proper configuration for alignment in the at least two orthogonal planes of the set of operating components.
