| CPC F16B 31/043 (2013.01) [E02F 3/3604 (2013.01); E02F 3/966 (2013.01)] | 11 Claims |

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1. A method comprising:
threading a collar assembly, which includes a first collar and a plurality of fasteners extending through respective threaded holes of the first collar, onto a first threaded portion of a tie rod such that the collar assembly directly contacts an upper surface of the body of a hammer assembly;
tightening the fasteners to press against the upper surface of the body of the hammer assembly to stretch the tie rod and move a second collar, which is threaded onto a second threaded portion of the tie rod, away from a ledge inside the body of the hammer assembly by a predetermined distance;
after said tightening the fasteners, hand-tightening the second collar to be in direct contact with the ledge formed inside the body of the hammer assembly and such that a portion of the body of the hammer assembly is around an outer sidewall of the second collar; and
after said hand-tightening the second collar to be in direct contact with the ledge formed inside the body of the hammer assembly, further tightening the second collar against the ledge using a tightening tool.
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