dredman

I have a few grinders that need cleaning/rebuilding. I'm looking for a company that does this or a manual for how to do it myself. Has anyone used such a service or have an idea of how to disassemble/clean/reassemble? If this isn't your business but have done them before I'm happy to discuss a simple arrangement. These are durable grinders that need internal maintenance to last and I'd like to find a way of doing it.