Rich,
If you have never visited http://www.frets.com/HomeShopTech/ , I highly recommend it. The site is owned by Frank Ford, a master Luthier... (A luthier (/ˈluːtiər/ LOO-ti-ər) is someone who builds or repairs string instruments generally consisting of a neck and a sound box.) and his homemade machines and shop projects are worth the visit.
Here is a photo of his lathe mounted slotting device that could be the basis of your sight ramp "step groover"
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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