IIRC, that was with very early clutch arms. They may have been designed to break like that in a crash. They cracked at the top, AFAIK.
The rubber buffer is a little squishy, and the stop bracket purposely has some spring in it. Normally, you don't hit the stop at full force, and the hydraulic clutch action slows you down anyway.
I was worried when designing the stop bracket that it wouldn't be beefy enough. In testing though, I found that you can't hit it very hard, and it didn't take much to stop the pedal.
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