Took 30 seconds before a compressor end broke while compressing Escalade springs. The springs aren't very heavy, I was a bit shocked that the supercharger shattered like that. The pin holding the end piece just broke. I welded it back on and it worked great after that, but for the price I wouldn't expect to have to weld it together for it to work as advertised. My cheaper McPherson compressors have been used dozens of times over the last 5 years and have never given me any problems, I just thought they would be more durable/safe. I was wrong. It's all held in place by a tiny pin.