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  • But late to reply sorry, but one of these inspection cameras are great for investigating that kind of thing. At under £40 they are a lot cheaper that the ones made by tool manufacturers and will connect to your phone so you can use its screen to see what going on. I've got one and its paid for itself many times over.

  • I have one you can borrow if you need. Micro USB though so if your phone is USB C you'll need to connect it to a laptop.

    I promise it's been long enough since it went up my nose out of curiosity that and Covid will have died off.

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