Methods of manufacturing gas spring end member assemblies and gas spring assemblies including same

A method of manufacturing a gas spring end member assembly, said method comprising:

• injecting a first quantity of polymeric material into a first mold cavity at least partially defined by first and second first mold sections thereby molding a first end member section having a first section wall that includes a first outer peripheral wall portion;
• injecting a second quantity of polymeric material into a second mold cavity at least partially defined by first and second second mold sections thereby molding a second end member section that is separate from said first end member section, said second end member section including a second section wall that includes a second outer peripheral wall portion;
• separating said first first mold section from said second first mold section thereby exposing at least said first outer peripheral wall portion of said first section wall while said first end member section remains in situ in a portion of said first mold cavity of said second first mold section;
• separating said first second mold section from said second second mold section thereby exposing at least said second outer peripheral wall portion of said second section wall while said second end member section remains in situ in a portion of said second mold cavity of said second second mold section;
• introducing said first end member section in situ in said portion of said first mold cavity of said second first mold section to said second end member section in situ in said portion of said second mold cavity of said second second mold section thereby forming a groove extending peripherally around said first and second end member sections;
• and,
• injecting a third quantity of polymeric material in situ into said groove between said first and second end member sections thereby forming a third end member section operatively connecting said first and second end member sections such that a substantially fluid-tight joint is formed therebetween.