arms 38 and 40 are constructed from steels of appropriate size and strength to accommodate the compression pressures in particular high tensile strength t 1 steel is used throughout the assemblies 2 and 4 the overall size of the compression assembly 8 is approximately 7 feet long and 3 to 4 feet wide each arm 38 and 40 is approximately 14 inches wide and a 20 inch space is provided between the arms which is sufficient to accommodate a 15 inch compression ram 80 a hydraulic cylinder 48 extends between the longitudinal arm 52 and the body 55 and is operable under remote control to rotate the longitudinal arm 52 relative to the pivot pin 56 into and out of parallel relation with the stationary arm 40 when rotated outward the transverse cross arm 54 is drawn away from the stationary arm 40 which exposes the full width of the slot portion 36 the guideplate 30 can then be aligned with the casing 6 once the compression assembly 8 has been aligned and the casing 6 is brought to bear against the compression die 10 the cylinder 48 is engaged to rotate the articulating arm portions 52 54 into alignment with the stationary arm 40 this action also induces the transverse arm 54 into abutment with the edge mounted plate 70 of the stationary arm 40 as the transverse arm 54 abuts the stationary arm 40 a projection 72 at the distal end of the arm 54 is brought into engagement with a chamfered surface 74 of an end stop spacer member 76 which is secured at a pin 77 between the plates 66 68 of the stationary arm 40 the engagement of the projection.