Final fit check with board in place.

We always make things "tool safe" which means that
everything is slightly loose.
It is easier to remove material from the tool by machining when you need to tighten it up.
When the parts are too tight or there is an interference you will need to weld the tool (adding material by welding) and remachining or by cutting a pocket in the area that needs to be changed and filling it with material that can be machined again (referred to as "inserting" the tool).