Has anyone modified a Fisher handheld pinpointer?

[slowNsteady]

Hi everybody,
When I bought my F2, it came with a handheld pinpointer. It will detect a quarter at 3/4". I really can't think of a use for this thing with this kind of performance. Right now it's holding its own as a dust collector. Is it possible to modify this thing so it will actually detect an object at about 2 1/2" - 3" or more? I have read the posts on converting stud finders, but I'd rather work with this one if possible. Any help will be greatly appreciated, Thanks!

[Frankn]

Do you really want 2 1/2" on a pinpointer? I usually set mine at 1". That way it doesn't drive me crazy in a small hole. Most pinpointers have a pot inside that can set sensitivity. Just look for an adjustment screw, BUT note it's position BEFORE you turn it. That way if you botch it up, you can reset it. The cheap way out is to get a harbor freight pinpointer. It will give you your 2 1/2 " pickup and the adjustment pot is on the outside. The best part is it cost under $20! It even has a headlite for dark holes! Now if you want an indicator light that goes on with the buzzer, add a LED to the case and hook the leads to the buzzer. The long lead+ of the LED goes to the red buzzer wire. The short lead- of the LED goes to the black wire of the buzzer.

[slowNsteady]

Hi,
Thanks for the advice. I opened up the case and there was an adjustment inside. I was able to get a 1/2" greater depth. It's still far from what I'm looking for, but it's much better now. I have been following the threads on the Harbor Freight and Garrett pin pointers as well. Thanks again!

[woodstock]

To get my increase on my Harbor Freight to about 2-1/2" I adjusted both the outside sensitivity turning knob and the little blue pot inside with the tiny brass screw inside. But be careful cause it's ez to strip the threading! Also be sure to make a small mark so you can return it to factory setting if needed. I also replaced the push on and hold on button with a push on/push off of better quality and buzz motor for vibration instead of the noisy little pezo. And a toggle switch to turn on and off the light cause I don't detect at night and you can't really see the light in the daytime when your eyes are adjusted to the sun...or at least I can't see it.
I also installed a rubber "o" ring on the outside adjustment knob and a larger knob. Makes it easier to adjust with bigger fingers and the "o" ring helps it hold the adjustment.
All these parts are available at RS and an hour or so free time, total costs about $25. Woodstock