Here's a good video of the mechanism: http://www.youtube.com/watch?v=E3mzhvMgrLE http://www.youtube.com/watch?v=E3mzhvMgrLE I'm not sure there's much wiggle ro

Here's a good video of the mechanism: http://www.youtube.com/watch?v=E3mzhvMgrLE http://www.youtube.com/watch?v=E3mzhvMgrLE I'm not sure there's much wiggle room in terms of "finger detection" (as others have said, conductivity of wet wood is just very similar), but perhaps the brake could be designed in a way that doesn't trash the machine every time it goes off.