Patent ID: 8678112

Claim:
A system comprising: a clamping die for engagement with a cylindrical body, the clamping die including: a clamping face arranged to be able to extend in parallel with a center axis of the cylindrical body, wherein said clamping face is concavely curved; two lateral surfaces adjacent to the clamping face and in close proximity to the clamping face, wherein a first lateral surface of the two lateral surfaces includes a first groove provided longitudinally along the first lateral surface and a second lateral surface of the two lateral surfaces includes a second groove provided longitudinally along the second lateral surface; wherein the first and second grooves are provided longitudinally along the entire length of the two lateral surfaces and extend substantially parallel with the clamping face; and wherein the first and second grooves and said clamping face form flexible clamping die lips between the clamping face and each of the first and second grooves along lateral edges of the clamping face to enable the flexible clamping die lips to yield when the clamping die engages a cylindrical body having a diameter larger than that of the diameter of curvature of the clamping die such that the area of engagement between the cylindrical body and the clamping die increases and results in less surface pressure on the cylindrical body from the clamping die.