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I"ve used these as well. Couple of pointers:Stretch out the springs. It makes the bells have more movement with less motion.Pile up some snow slush just above the line of site from you to the light when in loaded position. That way you can't see the light or it's dimmer/not obvious until it trips.
dang nab it i knew i should have read the entire thread! 2 posts in and there i go to amazon to place my order - 10/$3.99 cad. - but then i'm thinking to myself how great it would be if the light only came on when it was vertical... oh well what's $3.99. so wingfan87 do you have a link to where you got your lights?