Method of making a sample liquid aspiration and dispensing probe

A method of making an aspiration and dispensing probe comprising,

• a) forming a hollow plastic inner member with first and second longitudinal sections of different diameter joined by plastic transition section that reduces the diameter of the inner member from the first longitudinal section to the second longitudinal section,
• b) forming a hollow metallic outer member with first and second longitudinal sections of different diameter joined by a metal transition section in the shape of a hollow frustum of a cone,
• c) sizing the outside and inside members to permit disposition of the inner member in the outer member such that the respective first and second sections of each member are in substantially coextensive surface-to-surface contact and the respective transition sections are longitudinally aligned,
• d) assembling the plastic members, and
• e) annealing the inner plastic member to temporarily soften the plastic member to enable the plastic transition section to confirm with the metal transition section in substantially coextensive surface-to surface contact between the respective transition sections.