Abstract: A pair of angle iron chocks are disposed with one flange of each chock in confronting relation with a like flange on the other chock on a common supporting surface and opposing sides of a horizontally disposed cylinder. A length of flexible strapping is threaded at its respective end portions through a plurality of outstanding loops transversely secured to the surfaces of each chock in a manner to maintain the chocks in close proximity with respect to the adjacent arcuate surface of the cylinder.