this position the ports 52 on the shuttle sleeve 44 will be aligned with the manifold groove 56 at the exterior of the hollow rod ports 54 so that pressure inside the hollow rod 26 will be communicated with the internal pressure chamber 36 defined by the elastomeric tube 34 thus in rebound movement of the inner and outer bodies the friction shoes 32 will be forced by a fluid pressure outwardly against the inner surface 16 of the outer body 14 in a manner to supplement the controlled frictional drag of the end fitting carried bearing segments 74 biased by the same fluid pressure in the described embodiment because of the low coefficient of friction in the nonmetallic members 71 32 and 74 the guiding function of the collar bearing 70 and of the end portions of the shoe segments 74 in the illustrated embodiment will have little or no parasitic frictional damping effect on relative movement of the inner and outer bodies 12 and 14 on the other hand a combination of friction surface area and normal force is available to control the frictional drag exerted between the inner and outer bodies for example the shuttle carried friction shoes 32 in the illustrated embodiment are shown to have much larger surface area than the surface area of the shoes 74 or portion thereof subject to variable normal force by regulated.