The sewing machine is a great instance of acute body horror. I mean, that's excruciatingly painful! I have a friend who had his hand "gloved" in a shop accident involving the power takeoff of a diesel engine and he described it as the most painful thing afterwards. When it happened he was in a state of extreme shock. I just can't tell you how awful your idea is, and that's why it's a good idea! You've made one reader cringe already, good job.
As for the bowl, it's a little on the dry side. Sure that would really suck, but it doesn't do anything for me. I'm not saying it's boring and pointless, but it's just not my cup.of tea despite being fairly well written.