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I wonder if a really strong magnet(such as a speaker magnet) would pull enough through the liner to help you find where the pocket is. Of course when it quit pulling, that would be the hole. Then you can do the trick I do when poking holes in drywall, and make a small cuts to the edge to mark the boundaries of the hole.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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