This routine from Alan Thompson allows you to select an existing fillet in AutoCAD and interactively edit the radius. You can pick a new length, enter a numerical value, or use the keyboard to increase or decrease the radius by whatever value you choose, one step at a time. Start by loading the LISP file, then type in the command CF. Select an arc tangent to two lines, or a polyline arc. The current radius is reported, and at this point you can choose two points to define a new radius, enter a new radius value, or use the + and - (plus and minus) keys to change the radius. You can adjust the increment value using the Settings option before selecting the arc.
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