Helical tubular compression-spring

A compression-spring assembly comprising:

• a tubular guide-rod formed by sweeping a first non-circular cross-section perpendicular to a first longitudinal-axis along a first helical-path about the first longitudinal-axis, wherein the first helical-path has a first pitch-length;
• a slider defining a tubular bore to receive the guide-rod, wherein the tubular bore is formed by sweeping a second non-circular cross-section perpendicular to a second longitudinal-axis along a second helical-path about the second longitudinal-axis, wherein the second helical-path has a second pitch-length;
• wherein the first and second non-circular cross-sections comprise outer boundaries of an identical shape, and the first and second pitch-lengths are different;
• wherein the tubular guide-rod and the tubular bore comprise an aligned-position in which the first and second longitudinal-axes coincide;
• and
• wherein inserting the tubular guide-rod into the tubular bore of the slider from the aligned-position along the coincident first and second longitudinal-axes induces elastic-deformation of the tubular guide-rod due to a geometric-mismatch between the tubular guide-rod and the tubular bore arising from the difference in the first and second pitch-lengths, thereby generating a restoring-force that, upon release, returns the tubular guide-rod and the slider toward the aligned-position.