Sealey coil spring compressors sealey vs392 this rebound spring strut tool from sealey allows the piston to be held safely in the extended position when replacing internal rebound spring shock absorbers macpherson strut these shock absorbers are used to reduce vehicle roll and in some cases replace the use of the anti roll bar which is becoming more popular on modern vehicles features a piston shaft clamp with nylon jaws and telescopic puller sealey vs392 rebound spring strut tool