when you measure a horizontal straight line from the high bar to the low bar you have a 'drop' distance of 33 inches. and with ALL manufacturers uneven bars, if you move the high bar or low bar just 1 'click' can cause a change of 2 inches upon raising or lowering. the FIG and their safety commissions are aware of the following. if a gymnast is performing a bail swing to handstand on the low bar, and it came from a handstand on the high bar, they will create mass x force swing that will produce 10 x the gymnasts body mass. so, if the gymnast is 100 pounds, that will be a total of 1500 pounds per square inch of force when that same athlete drops from the high bar to the low bar. i don't think a dissertation is required here for one to ascertain the forces being applied to the hands/bones, wrists/bones and the elbow structure. in fact, you will be hard pressed to find china doing bails and counter swings [some call these straddle backs] due to the spike in injuries they experienced just a few years ago. their release of choice is a pak salto. and this is in large part due to their orthopaedic anatomies. different cultures are anatomically/anthropometrically different from each other. for another conversation, this is why you find ALL of their gymnasts performing intricate invert work. therefore, if you raise the high bar 2 'clicks' and leave the low bar at FIG you find a total of 37 inches in the drop from the high bar to the low bar. that's over 3 feet. now don't try this at home...but imagine standing 3 feet above the ground and jumping down to a handstand on the ground. now imagine doing the same on to a bar...