Thanks for the cen-tek mod threads

Nice job...you did way better than me.
Never could get the switch to fit in the unit right...guess that's why they make electrical tape!

i hooked up a small vibrating motor insted of that loud speaker, i also switched out the power button with a more flush button that seems sealed better. i also added a drop of "lock tite" to the nut that holds the probe shaft and put a piece of heat shrink near the tip of the probe to keep dirt out, along with a piece of tape over the speaker hole to keep dirt out. the vibrating motor cost me 4 bucks and a new button was around 3 bucks which were all from radio shack. while the back was off i also gave the sensitivity pot a slight turn and now my cen tech can reach about 4-5 inches on coin sized targets if needed(i normally turn down the sensitivity knob down to about 2 inches of depth) if ya do hook up the micro vibrating motor a 33 ohm resistor is needed on the red wire of the motor(99 cents for 5 of them at radio shack)
i was so happy with the results that i went out and picked up a backup cen tech and did the mods. i use the cen tech every hunt and keep the vibra probe my wife bought me at home.

Get a thing of Plastidip and dip the tip to waterproof it.

Way to go CTKidd! It was my first attempt at soldering too. Luckily, it all turned out o.k. HH