{HEAD ~ The inner cylindrical member} 40 is clamped between the spring receiving portions 4e of rear cylindrical members 4 and connection pipes 3 screwed on {TAIL ~ end portions} of the rear cylindrical members 4 
{ HEAD ~ The inner cylindrical member } 40 is clamped between the spring receiving portions 4e of rear cylindrical members 4 and connection pipes 3 screwed on { TAIL ~ end portions } of the rear cylindrical members 4
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH