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A shim measuring apparatus to determine the thickness of a shim, with the shim used with a ball joint including a snap-ring and a controlled arm having a bore and a notch. The measuring apparatus comprises an upper housing including a measuring device and a lower housing coupled to the upper housing

A shim measuring apparatus to determine the thickness of a shim, with the shim used with a ball joint including a snap-ring and a controlled arm having a bore and a notch. The measuring apparatus comprises an upper housing including a measuring device and a lower housing coupled to the upper housing. The lower housing is configured to receive the ball joint and to engage the notch in the bore. The distance between the upper housing and the lower housing while a load is applied is measured by the measuring device. Such distance between the upper housing and the lower housing represents the shim thickness.

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A shim measuring apparatus to determine the thickness of a shim, with the shim used with a ball joint including a snap-ring and a controlled arm having a bore and a notch. The measuring apparatus comprises an upper housing including a measuring device and a lower housing coupled to the upper housing

A shim measuring apparatus to determine the thickness of a shim, with the shim used with a ball joint including a snap-ring and a controlled arm having a bore and a notch. The measuring apparatus comprises an upper housing including a measuring device and a lower housing coupled to the upper housing. The lower housing is configured to receive the ball joint and to engage the notch in the bore. The distance between the upper housing and the lower housing while a load is applied is measured by the measuring device. Such distance between the upper housing and the lower housing represents the shim thickness. channeling the air about the head of the user; a gown including a body portion for covering the body of the user and a head portion for covering said base section of said helmet assembly, said head portion of said gown operating as a filter medium to filter air between the user and the external environment; a skirt removably attached to said body portion of said gown exclusively at a front of said gown; and a fan module mounted to at least one of said inner and outer shells and including at least one air inlet and at least two air outlets, said fan module drawing air in through said at least one air inlet and distributing the air out through said air outlets into said at least one air flow channel for distributing air about the head of the user. 24. A helmet assembly of an air filtration system for mounting to a head of a user to distribute air about the head of the user, said assembly comprising: an inner structural shell; an outer structural shell extending from said inner structural shell to define at least one air flow channel between said inner and outer shells for channeling air about the head of the user; a fan module mounted to at least one of said inner and outer shells and including at least one air inlet and at least two air outlets, said fan module drawing air in through said