Mystery of the 90 ohm Grado driver

The sound on one driver cuts out completely if I tap it with my finger hard enough. And tapping it again brings the sound back. I did a quick check on the driver's wire terminals and they do not appear to be shorted. The wiring looks sound too. My theory at the moment is there is a small particle inside somewhere that jams up the moving parts.

I'd appreciate any advice from you experienced Grado modders. Is this something I can fix?

Or have I just been sloppy in checking the wiring? I'll even try resoldering this if anyone thinks the "small particle" theory is unlikely.

Thanks guys. I measured the resistance and the good side was fixed at around 33Ω while the bad side went as high as 90Ω, but varying each time I tapped the driver with my fingers. Jiggling the cable seems not to change anything though.

FYI I got these from someone else in this state. I had recabled them with new starquad figuring there was a short or bad solder, or even a bad wire. Will resolder the bad side again and hopefully get it right this time.

So I measured across the blobs of solder directly and got the same fluctuating ohm values as with the plug end point. Now I'm a little nervous that the tiny wires underneath might be in in an extremely delicate state. Any final tips before I desolder? Will probably put this off till tomorrow.

Many thanks! That comes as a bit of a relief to me actually.

Something else seems to be going on here. I reflowed the red wire solder with helping hands and lots of flux. No improvement. Reflowed the black wire solder too. But still no improvement. Cleaned up the gunk with isopropyl alcohol also.

I measured the resistance from the plug tip to the square solder pad things on the driver at 0.6Ω each. So the wiring looks to be okay. But when I measure between the two square pads, that's when the high resistance comes in.

I suppose the next step is to desolder it completely. A solder sucker should be able to handle those large blobs easily I think. Any precautions I need to take? Any suggestions on what to do after that?

Once again I fear there might be a little wire underneath on the edge of disintegration. Can't think of anything else that would cause these high resistance readings.

Desoldered. The little wires look all right to me. Any ideas on why this Grado driver measures at 90Ω (and sometimes more)? Is this the end of the road?