Where those the klines, Butch?
About 1980 Klines first rigid pad was set on the frame at a hard 90 angle. Which made only the top of the pad come in contact with the shin. A terrible design, but the pad itself was cush. A few years later Kline modified the pad by tilting it forward about 15 degrees and left slop in its fit with the top of the frame. That simple fix practically evened all the back pressure exerted on the shin. and being rigid it eliminated climber kick back. It was one of the first innovations towards making spurs ergonomic and half ass comfortable to wear.
Just a simple tweak.