Abstract: A mandrel including an elongated arm having a first end and a second end, a reciprocatable shaft coaxially aligned with and extending through the arm, a first end of the shaft extending beyond the first end of the arm and a second end of the shaft extending beyond the second end of the arm, a presser means mounted at the first end of the shaft, an expandable disk shaped member coaxially aligned with and slidably mounted on the shaft between the presser means and the first end of the arm, a compression means mounted on the second end of the shaft, and a resilient helical spring coaxially aligned with and slidably mounted on the shaft between the presser means and the compression means, the compression means adopted to apply compression pressure to the disk shaped member and to the helical spring. This mandrel is used in a process for coating hollow cylinders.

Abstract: A mandrel for transporting a hollow cylinder including an elongated arm having an imaginary axis, an expandable disk shaped member having at least one hole and a circular outermost edge, the disk shaped member being mounted on and coaxially aligned with one end of the arm and including an elastomeric polymer material having a durometer of between about 25 and about 35 and a maximum continuous use temperature rating of at least about 230.degree. C., and means mounted on the mandrel to apply compressive pressure to the disk shaped member to increase the length of the circumference of the circular outermost edge. This mandrel is used in a process for coating hollow cylinders.