The issue explains itself but I'll paste it here for convenience sake.
Edit: I think I should specify, I am talking about the mining gadget.
The Knorke comment is of course open to everyone.I think it would be a good idea to do two things:
1. have the radius drawn part of a widget that could be turned on and off by the player.
2. have the radius be a pretty graphic instead of the spring engine GL draw ugliness.
Knorke, wanting input from you!