STABILIZERS FOR CARAVAN

Can somebody assist with identifying the caravan stabilizers I purchased second hand some years ago and am ready to fit now, but but am uncertain how to use . The set is clearly labelled "TAG ANTI SWAY TOWING STABILIZER" MADE BY ANTHONY PRODUCTS LTD,WELLINGTON,NZ. However,this company no longer exists and is not listed in the phone books of New Zealand.The stabilizer or anti sway system comprises of 2 leaf springs,joined together, about 3ft long attached at one end to the pull vehicle tow ball via a mount which bolts onto the goosneck under the ball,and at the other end the spring fits into an adjustable bracket which attaches to the caravan A bar. When attached, one can crank up the torsion,from low to high, with a handle protruding from the adjustable bracket on the A Bar.
I will gladly email a photo to anybody who thinks they know how it works,or better still has used this system and has a set of operating instructions.Please contact me.
Roman (near Melbourne,Australia) 21st June,2004