New and in need of wisdom

[Washout]

Perfect irving2008 - exactly what I need - the main block of ali will have a recess made into it 3mm deep and the dovetail will be around the edge of that - the chamfered plate will then slide into that so it is flush to the block surface. That mill will also solve another problem I had which is how to cut adjustment slots for a latch which will be mounted into the sliding plate (the plate itself will have to be a milled shape to make that work). Quick and dirty sketchup to show what I'm on about and thanks for the link: