Can the coil bolt / nut effect performance?

[Matt_SC]

My Eldorado had the wrong size coil bolt on it. It was a 8-32 which is one size too small. I picked up a replacement stainless 10-32 bolt and a nice knurled brass nut. Everything fits and works like it should but I'm worried that chunk of brass (the nut) sitting right above the coil might effect performance. The Tesoro nut is a plastic knob with a smaller brass insert. What do yall think?

 

[BillF]

I cant help but think it shouldnt be there. Most any hardware store should have nylon bolts and nuts.

 

[WV62]

Back in the 70"s the machines I used all had metal hardware to attach the coil, now days all that I have seen lately is the plastic type. If that was my detector I would be looking for something in plastic.

Ron in WV

 

[SkiWhiz]

There has been debate over this before. My take on it is that it won't hurt anything, I have used both on the same detector and didn't have an issue with either bolt & nut. The bolt and nut is noving with your coil so I don't see how it could pick it up. The only trouble that I can think of is if a detector has a VCO pinpoint or a threhold based all metal mode.

 

[BillF]

If you pass a metal object over the top of your coil it will sound off. Because most detectors are motion, you wouldnt notice the nut or bolt , but would it not be likely to affect performance?

 

[BarberBill]

I've seen this come up several times. For what it's worth I have rod/coil combinations with both types and have never been able to tell any difference. However, it seems all the manufacturer's have gone to the synthetic bolt/nut connections so if in doubt, change over. I have found synthetic bolts and wing nuts that fit the smaller size holes in the early, metal bolt coils and the larger sizes now being used so it's no problem to switch over and of course the earlier coil ears can be drilled out to fit the newer, larger synthetic bolts, if desired.
BB

 

[Rdunzl]

I went back to post by allcav on 8/13 (sorry, not sure how to paste it here) about a similar
query and he states, "if it's not stainless, you will have issues". Hope that helps.

 

[Fishers Ghost]

Metal coil bolts can affect some detectors more than others.
For example when bench testing my Scorp I left a 1/4 inch iron bolt close to the coil while in Auto and it killed the scorp totally. Drove the auto tune to its limits. Took the bolt away and all was good

 

[BarberBill]

In response to Redunzi - the metal bolt combos I have and do use are all the original, Tesoro stainless that used to come standard. That looks to be why I've never had a problem if stainless is okay.
BB

 

[allcav]

I went back to post by allcav on 8/13 (sorry, not sure how to paste it here) about a similar
query and he states, "if it's not stainless, you will have issues". Hope that helps.

This is true!

 

[Matt_SC]

I went for a short hunt yesterday with the stainless bolt & brass nut. I feel my Eldorado was just not quite right. It might have been my imagination but it seems my pinpointing was a little off to one side and the VCO in all metal mode acted strange too. I picked up a nylon bolt and nut and two fiber washers today. IF there really was a problem then this will fix it.

Thanks for everyone's replys!

 

[SkiWhiz]

I went for a short hunt yesterday with the stainless bolt & brass nut. I feel my Eldorado was just not quite right. It might have been my imagination but it seems my pinpointing was a little off to one side and the VCO in all metal mode acted strange too. I picked up a nylon bolt and nut and two fiber washers today. IF there really was a problem then this will fix it.

Thanks for everyone's replys!

Matt, let us know if the nylon bolt & nut makes a difference.

 

[YuriyV]

>Because most detectors are motion, you wouldnt notice the nut or bolt , but would it not be likely to affect performance?
As I know, metal bolt could cause a blind spots for detector even if it is stainless and not noticable at a first glance.

 

[BillF]

>Because most detectors are motion, you wouldnt notice the nut or bolt , but would it not be likely to affect performance?
As I know, metal bolt could cause a blind spots for detector even if it is stainless and not noticable at a first glance.

My point, exactly.

 

[Matt_SC]

Just got back from a short one hour hunt with the Eldo and the nylon bolt / nut. I run the discrimination just above iron and dug most repeatable signals. Only found $.37 in clad and a bunch of trash but I'm still new at this and learning more every day!

There are 2 things I can say for certain are improved since replacing the stainless bolt and brass nut:

1) Pinpointing is now spot on. Just for the record it also was with the 8-32 stainless bolt and wing nut but was not with the 10-32 stainless bolt and brass nut. I suspect the brass nut was the biggest problem.

2) It was real slow to auto tune when in all metal with the brass nut setup. It's now very quick to retune itself with the nylon setup.

There were other things I noticed that I'd like to attribute to the nylon bolt & nut but I can't be sure. I found a number of really small trash items today. Small pieces of pull tabs and the guts (ink tube with the metal tip) from a ball point pen, just to name a couple. It SEEMS the Eldorado is more sensitive than it was. Of course it could be like when you put new spark plugs in your car. It FEELS like it gains 20 horsepower just 'cause you think it did!

 

[stasys]

Metal bolt is not any problem if its sits tide, but if its becomes loose- you will have problem. I had the same problem with my first metal detector, Tesoro Cibola, and what do you think I did? I disassemble coil to cure problem.... this why you need plastic bolt, because in discrimination you will discriminate moving bolt-if its iron, and will get positive signal if its Tesoro original. From my Tesoro Cibola metal coil bolt I am very angry on Tesoro producers. They should have to mention this problem in the manual or put some attention sticker on the coil.Throw your metal bolt so far away- that you will never see it again --NEVER.