Bret, I am sorry about your loss, buy not giving the correct info is bad advice. As far as insurance goes, if you make and sell knives, you need to say so.
As a GENERAL rule:
If it is a hobby, it doesn't void your insurance.
If you sell a few items to pay some hobby expenses, it isn't a business.
If you sell a dollar amount that would be considered "income" by most folks, it may be considered a business ( even if it does not make a profit).
If you have a separate bank account, take credit cards, have a website, sell on eBay, sell in a "sales forum", take paypal payments, etc.......you will likely be considered a business.
In many cases, even if the policy is still valid for your house and contents, it will not cover your tools.
If you have a forge or HT oven in a garage, it may be a problem. Putting them on rolling carts or in an outside work shed may solve that problem.
In almost all cities, and many other localities, a propane tank can NOT be inside a building...even a garage. In some places, they have to be 20 feet away. Check this out, as it may be a bigger problem than the insurance policy.
Call your agent and make an appointment. Don't discuss this over the phone...do it face to face.
Be honest with him/her. Tell them exactly what you do as a hobby, and how much you spend on supplies vs the amount you make on the dew sales you have. Make it clear that this is a hobby if that is what it is. Also, make a list of your tools (and materials if some are expensive) and put values on them. Give this to the agent and ask if you need to increase your coverage, or have a rider policy.
If you are truly a hobby maker, in most cases the agent will note these things in your file and tell you that all is fine. In some cases he/she will send the info tom the underwriter for clarification.
If you really have a knife business, be a mensch and get a license, tax ID#, and business insurance. Sometimes that makes people go back to hobby making, and other times it makes them take their business seriously and work to increase sales.
Don't take the above info as the answer for any person's individual case. Location and specifics may change many things. TALK TO YOUR AGENT!