Zero adjustment gauge instrument

Claim 1

In a gauge instrument including a casing of assembled axially contiguous first and second coaxial components in which the first of said components comprises a cup-like case containing calibrated indicia of condition values and the second of sAid components comprises a relatively rotatable tubular stem containing a condition responsive means operably cooperative with said indicia for visual indication of condition values being measured and means forming an interlock against axial self disassembly of said components, the improvement for zero adjustment comprising mounting means securing said casing components for coaxial angular displacement therebetween, said mounting means consisting essentially of an annular sheet metal sleeve of diameter larger than said stem coaxially secured permanently thereon for relative rotation therewith and terminating in an annular flange enlargement extending predominantly in a radial direction, said sleeve being secured with the contiguous peripheral face surface of its flange in axially forced engagement against an external facing surface of said case axially deflecting said flange enlargement for said engaging surfaces to provide a predetermined frictional restraint against said angular displacement.