Tesoro 11" widescan µMax coil opened up, falsing problem:

[Qiaozhi]

Interesting. The bottom half of the coil relative to the photo, is mainly where the falsing seems to be coming from, I think you may be right. Is it safe to pull the rest of the foam/coil off the housing?

Solder the wire to a short spring (10mm to 15mm long) of about 15mm diameter. When you refit the bottom half of the coil shell, the spring will make electrical contact. Garrett Crossfire coils use an electrostatic sheet either side of the coils, and this is how they get a good connection.

[kt315]

this photo gives you the clues

[Pinpoint]

This thread gave me some clues:
http://metaldetectingforum.com/showthread.php?t=13360

Others seem to have the same problem as me.

[Pinpoint]

the wire is going to Faraday shield of another housing part, that is not on the photo.
your problem may be a breaking cable at low part near to housing.

Interesting. The bottom half of the coil relative to the photo, is mainly where the falsing seems to be coming from, I think you may be right. Is it safe to pull the rest of the foam/coil off the housing?

[kt315]

I see that there's a wire sticking out from the middle, I moved it around

the wire is going to Faraday shield of another housing part, that is not on the photo.
your problem may be a breaking cable at low part near to housing.

[Pinpoint]

I have recently opened up a coil of mine because it was falsing even with the slightest touch, no matter what setting (I can't afford to send it back and forth, postage would cost almost as much a new coil!). Upon opening it up, I see that there's a wire sticking out from the middle, I moved it around and that's not the source of the problem. I tap the sponge and it falses then, or even if I tap other parts of the coil.

Does anyone know what could be causing this problem, and what the solution might be?

Here's a photo of coil opened up: