Even the tools, shop, and other meaningful assets can be protected. (IANAL but I've seen this model used at a few places I've worked.)
Set up a second LLC/Corp. That LLC/Corp owns all tools, real estate, other assets of any meaningful value and leases them to the knife making LLC/Corp you've set up.
Creates a lot of accounting and legal work/expense though. But, if the knifemaking LLC/Corp owns nothing, there is nothing to be lost to a judgement or lien.