You've accepted that this hobby has stolen your husband when:
He stands outside in sideways rain gleefully holding a wind speed indicator
You never want to ask "what are you doing?" when you haven't set aside time for the full answer that you know is coming
Your kitchen table will never see plates of food again
You don't find it unusual that his fingers are stuck between two magnetized brake rotors and he needs your help
You know that trash is subject to inspection... your's, your family's...
Your parents round up all the tools he will need to disassemble their broken microwave and they know he is not going to be fixing it
You now know that there is a nearby refuse recycle plant that gives stuff away for free