It's always been a little hit and miss since I bought it, but after dropping it a while ago (and then onto carpet from a relatively low height) it got steadily worse - It always turned on but wouldn't pick up a note without a lot of wiggling and turning it round.
Eventually it stopped reacting altogether, but before buying a replacement I thought I'd have a look inside, finding a small piezo transducer that looked a bit scuffed up. I might have tried rotating that a little but when I got a small screwdriver underneath it, it pinged off into the mess in the corner of my workshop and out of sight.
This morning a new £2 transducer arrived via eBay and it now works better than ever.
"I'll probably be in the bins at Newport Pagnell services." fretmeister
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sorry, there wasn't really much to see other than the little transducer attached to the case followed by a gap once it had been launched.
here's a picture of some transducers and one of a dismantled Snark (not mine)