I had some troubles and was disappointed with the tool. I watched this [link=http://www.youtube.com/watch?v=nCNjg5HkPFw]Youtube Video [/link]and practiced on some scrap and can now slot 1/8" control surfaces. I also bought one of the guide fences and had pretty good luck with it. I bought a couple more at a swap meet and have them set to center on various wood thicknesses, this way I never have to adjust the guide when I switch wood thicknesses. I tried higley's slotter and dubros slot kit but I find the more I use the power slotter the less I reach for the old tools.