if you look on marlin or trailgears site in the tech section i think, there is a right up with step by step instrustions, an pictures on how to do it, ill try and find it and give ya the link.
hear ya go http://www.trail-gear.com/instructions
This is what they sent with the adapter and doesn't cover how to take it apart just how to use the already taken apart case back together with the adapter.