Anyone know how Harvester guitars attach the neck to body?

[repoman]

I'm musing about building an aluminum neck guitar and wondering how Harvester guitars attach the neck to the body on the aluminum necked ones, there looks to be a half-rod sitting in a cavity in the body that has screws going through the body into it, and then the half-rod neck is somehow attached to this rod sitting in the body, I'm curious how it is secured. Anyone have one of these? I seem to remember some members here having iterations of these guitars.

[TheTransient]

I have seen images where there are spreading-washers sitting over holes on the back of the body along the line of the neck mount. Presumably a bolt would go through that, then into the half-rod inset in the body, and thread into the neck, pulling it all together.

Never had the opportunity to see a Harvester in real life, so I could be way off, but I have spent a decent amount of time ogling them online haha