if i was to take the screws out of the hand held would i see something obvious that mybe needs to be re-soadered ? or is it something you can't see ? or if i'm careful, if i have the machine un-plugged and take each board and u-plug it and make sure its clean on the connections will that help ? because the guy i got this from seemed to be a really honest old guy and said it worked fine so i keep thinking that i am doing something wrong ?? but i don't want the router to go up again and come crashing down and screw something up....isn't there a place in northern ca that works on these ?? i feel kinda stuck, i don't know what this machine is worth as is, i don't know if its me and it works fine and a new control system seems to be exspensive.....thanks