Big thanks to rusigor for the link to the pictures. I've just converted my TT Go 700 to a 16GB using a micro SD adapter, virtually the same as in rusigor's.
I sourced it off Ali Express but later found I could have got the same Compact Flash to Micro SD adapter more quickly off eBay. Just search for "Micro SD Extreme CF Adapter". Prices around £10. (There are also lots of offers of dual slot adapters - no idea if they would work in this situation so I would stick to single SD or single Micro SD versions - see rusigor's pictures).
I found a You Tube video which helped with taking it apart [Only registered and activated users can see links. ] but note that it is a video about battery replacement so not exactly the same. For anyone trying this, there is silver foil (presumably some kind of RF shield) all round the bottom of the unit which needs to be peeled back (not off). But it is easy if taken carefully.
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