You were very lucky. The medical literature is full of cases of serious injury to the penis or testicles from things like vacuum cleaners, sanders, hair dryers, etc. My "ex" was a nurse in the ER and told me about all sorts of things she had seen.

Here is a link discussing such injuries:

http://tafkac.org/medical/vacuum_injuries.html

"Dr. A" says "Never put your penis in anything you aren't sure it will come out of..."