I hate the Werner Ladder Jacks.Theres limited positions and those dam little stops that hold the Werner Stageing Planks are an pain in the ***.They do hold the Werner plank good.Anyway I measured,made my marks for the new slots.I first drilled the hole on the end.Then with a Dremel I started to cut and score my lines.Then I used a sawzall to finish my cut.I then used the Dremel and a file to round and smooth it out.I hope this works an gives me more posisitions.