lower chamber 37 of the main elastomeric spring element a protective cap 38 is mounted on the lower chamber 37 to protect the main elastomeric spring element and provide room for the lower chamber 37 to expand the application of a hydraulic body mount 31 is determined by the desire to provide additional damping of vibration at any particular offrigger bracket 15 the primary vibration control is provided by the elastomeric body mount 21 as is the absorption of the operational loading between the frame 10 and the automotive component 19 where noise or vibration transmission at any particular point on the frame 10 needs to be further dampened a hydraulic body mount 31 can be added to the elastomeric body mount 21 to enhance vibrational control referring to fig2 6 to mount the hydraulic body mount 31 to a chosen elastomeric shear type body mount 21 the hydraulic body mount 31 is positioned such that the connecting member 32 becomes engaged with the threaded lower end of the attachment bolt 25 extending below the bolt head or nut 29 the rigid connecting member 32 is first threaded onto the attachment bolt 25 until the mating threads in the connecting member 32 bottoms out either.