Instrument Support Apparatus Having Non-Horizontal Tiers and Vertical Axis Pivot Capability

A retention apparatus comprising:

• a compression sleeve element:
• adapted to at least partially surround a first portion of a first elongated member and a second portion of a larger elongated member, wherein a third portion of said first elongated member is nested in at least a fourth portion of said larger elongated member, and
• having a first elongated member compression surface and a larger elongated member compression surface,
• wherein said third portion of said first elongated member has a first longitudinal axis and said at least a fourth portion of said larger elongated member has a second longitudinal axis,
• a compression enhancement element established so that, upon activation, it forces said:
• larger elongated member compression surface towards said larger elongated member, and
• said first elongated member compression surface towards a site on said first elongated member that is not within said larger elongated member,
• said compression apparatus further comprising:
• a relative motion obstruction element adapted to prevent only axial and rotational motion of said compression sleeve element relative to said larger elongated member,
• wherein said third portion of said first elongated member and said at least a fourth portion of said larger elongated member are substantially coaxial,
• wherein said at least a fourth portion of said larger elongated member is hollow,
• wherein said relative motion obstruction element comprises at least one projection and at least one recess,
• wherein said compression sleeve element is separated along at least one split from a first elongated member proximate edge of the compression sleeve element to a larger elongated member proximate edge of the compression sleeve element, and
• wherein said compression sleeve element is perpendicularly displaceable and perpendicularly removable, relative to said second longitudinal axis, from said first elongated member and said larger elongated member upon deactivation of and effective disengagement of said compression enhancement element.