"The braisa concludes that anyone who transgresses the words of the Chachamim is chayav misa." (source)

"Someone who squeezes out (wet) clothing until all the water has come out is chayav for laundering, since squeezing is part of the laundering process, just like stirring is part of cooking. There is no squeezing with hair, or leather, and one is not chayav for squeezing them." (source)