AUSTRALIA Patents Act 1990 COMPLETE STANDARD PATENT SPECIFICATION FOR THE INVENTION ENTITLED: Symmetric Cattle Headbail Mounting Bracket This invention is described in the following statement:- SYMMETRIC CATTLE HEADBAIL MOUNTING BRACKET Field of the Invention The present invention relates generally to the design of cattle headbail devices, and specifically to mounting brackets for activation levers on such devices. Description of Related Art Cattle headbails are devices that are used to immobile cattle. Current art includes a number of designs, including Australian Patent No. 693503. These devices generally have an opening into which an animal is placed, then an activation lever is moved which closes the headbail and immobilises the animal. Market demand requires that the devices have the activation lever to the left or right of the animal. The activation lever is mechanically designed to translate the force and movement of the activation lever into a force and movement necessary to close the bail and to hold the animal. The activation lever is attached to a mounting bracket that is welded to a frame. In general, different brackets are required for left and right, front and rear lever locations. Object And Summary Of The Invention It is an object of the current invention to provide a single mounting bracket design that is symmetric and may be used in left, right, front and rear lever configurations. Thus, disclosed is a headbail mounting bracket that is symmetric, allowing mounting the activation lever on either the left or right-hand side of the headbail. Optionally, front and rear mounting of the activation lever is also enabled. Brief Description Of The Drawings Notwithstanding any other forms which may fall within the scope of the present invention, preferred forms of the invention will now be described by way of example only, with reference to the accompanying drawings in which: 1 FIG. 1 is a front perspective view of the current headbail in the area of the mounting bracket design, FIG. 2 is a perspective view of the current mounting bracket, FIG 3 is a front perspective view of a headbail with symmetric mounting bracket, FIG 4 is a rear view of the headbail depicted in Fig. 3, FIG 5 is a perspective view of a symmetric mounting bracket, FIG 6 is a rear perspective view of a headbail having front and rear activation levers, and FIG 7 is a perspective view of a symmetric mounting bracket having a grease nipple. Description Of The Preferred Embodiments Fig. 1 illustrates a prior art head bale assembly 10, with a bail 12, a frame 14, and a hydraulic locking strut 16. Also shown is an activation lever 18 mounted on the side of the frame 20 by means of a prior art mounting bracket 22. The activation lever 18 is connected to a cross arm assembly 24 such that movement of the activation lever 18 rotates the cross arm assembly 24 around the prior art mounting bracket 22. A generally flat cross arm assembly 24 is connected to a top link 26 and a bottom link 28 such that movement of the cross arm assembly 24 effectively opens or closes the bail 12. The flat cross arm assembly 24 is also connected to the top of a hydrostatic locking strut 62 which operates in a manner according to Australian Patent No. 693503 The prior art mounting bracket 22 is shown in more detail in a front view in Fig. 2. The prior art mounting bracket 22 comprises: a base plate 32; a pivot point 30 mounted on the base plate 32 through which the activation lever 18 is attached by a bolt (not shown); a T-plate 34 attached to and at right angles to the base plate; and a gusset 36 attached to 2 both the base plate 32 and the T-plate 34. Referring again to Fig. 1, when the activation lever 18 is mounted on the other side (not shown), a mirror image of the prior art mounting bracket 22 is required. This requires an inventory of different parts for the different activation lever configurations. Fig. 3 and Fig. 4 (and Figs. 5-7) illustrate a headbail with a symmetric and generally "T" shaped mounting bracket 40 of the present invention. It supports the activation lever 18. When the activation lever 18 is moved the link 48 drives the offset style cross arm 24 to rotate. The top link 26 and the bottom link 28 thus reciprocate, opening or closing the bail 12. Fig. 4 illustrates a symmetric mounting bracket from the rear, connected to the activation lever 18, and the offset cross arm 124. Also shown is the symmetric mounting bracket 40 welded to the frame 16. The symmetric mounting bracket has upper and lower pivot points 42 and 44. The upper pivot point 42 is connected to the cross arm 124 (from a point external to the bracket 40) and the bottom pivot point is connected to the activation lever 18 that rotates from between the side plates of the bracket 40. The cross arm 24 comprises two arms attached at right angles: a longer arm with offset ends 54 attached to the top link 26 and the bottom link 28; and a shorter arm 58, attached to the release mechanism at the top of the strut 62, and the gear link 48. The longer arm further comprises two offset bars 54 and 60 welded together and banded. The gear link 48 extends between the handle 18 and the arm 58 and provides increased leverage and rotational speed. Fig. 5 illustrates the symmetric mounting bracket 40 with pivot points 42 and 44, and attachment flange 46. Note that the pivots 42, 44 are held between side plates 142, 143. The side plates are joined to a spacer 144. Referring now to Figs. 3 and 4. The symmetric mounting bracket 40 further allows for the attachment of a gear link 48 between the upper portion of the activation lever 18 and the cross arm 24. Fig. 4. shows the rear view of the gear link 48 between the activation lever 18 and the cross arm 24. The gear link 48 acts as a lever arm for the activation lever 18 providing greater operational speed and requiring potentially less force to open 3 and close the bail 12. The improved mounting bracket provides the advantage over current art that it may be mounted on either left- or right-hand side of the frame, on the front or rear, thus allowing an inventory of a single part for left- and right-hand, front and rear configurations. Referring now to Fig. 6. Two activation levers 18A and 18B cooperate by means of a longitudinal torque bar 50. As either activation lever 18a or 18b is moved, both move together thus allowing for front or rear bail operations. An additional embodiment of the symmetric mounting bracket allows for a grease nipple to be located in one or both of the pivot points of the symmetric mounting bracket. Fig. 7 shows the symmetric mounting bracket 40 with pivot points 42 and 44. A grease nipple 52 is shown for pivot point 42 through which lubricant may be injected. The technology disclosed above allows for a single symmetric mounting bracket to be used in any headbail configuration, including: - a single activation lever mounted on the left or right, - a single activation lever mounted at the front or back - two or more activation levers mounted and connected via a torque bar, and - the inclusion of a grease nipple at one or both of the pivot points. 4