and thus the tailpiece retainer plate 18 and tailpiece 20 remain rotationally coupled to the cylinder plug 10 such that the tailpiece retainer plate 18 and tailpiece 20 cannot rotate independently of the cylinder plug 10 thus a conventional cylinder tailpiece assembly such as shown in fig1 can be modified in accordance with an aspect of the present invention to rotationally couple the tailpiece 20 to the cylinder plug 10 by drilling a hole 46 in the plug 10 at a location that is offset from the longitudinal axis of the cylinder plug drilling an aligned hole in the tailpiece retainer plate 18 and inserting a pin 42 through the tailpiece retainer plate and into the off center hole 46 in an alternative configuration to that shown in fig7 pin 42 may be replaced or assisted by an axially extending projection formed integrally with the tailpiece retainer plate and which can be inserted into a hole or other opening formed in the cylinder plug 10 at a location that is offset from the longitudinal axis of the cylinder plug fig8 shows an alternative embodiment of the invention this embodiment differs from others in that the circular or oblong hole 36 formed in the end 12 of the cylinder plug 10 is replaced with a rectangular hole.