Re: A thought on lapping...
You can also lap without any compound.
Remove all the oil and blue the surfaces and run the ways dry to see the contact area. If the dovetails have poor contact then don't oil them but oil the flats. By hand run the ways full travel with the dovetail dry. The high spots will grind away fairly fast. The flat will help to keep things straight.
After a 50 or 100 strokes re blue and see what you have and remove the dust. Repeat as needed leaving only one mating pair dry for each lap.
The main problem with lapping is it will remove too much material. You don't want to change the shape just remove high spots that cause binding. If the shape is wrong it is going to be a real PIA to get things straight.
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