ABSSAC - Using the unique machined spring product, the video shows one application that originally used three separate parts to acheive a compression spring assembly. The video shows how this assembly was replaced by a single piece, double start machined spring (that's two springs in one spring body and still one peice of material !) The same product can be used to supply extension, torsion and lateral bending springs with the added advantage of better accuracy and your choice of end attachments.For more details please visit - www.abssac.co.uk