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@niggle
Just looks like a pinned joint to me. Some of the cheaper ones start out with an edge you can catch your nail on and then any bit that is not actually subjected to brake wear stays like that. Also here is a more reasonably priced (£7) tool that could measure rim thickness: http://www.tickintimeworldofwatchtools.co.uk/jewellers-thickness-reading-gauge-00-15mm-949-p.asp
EDIT: also Chris Juden of the CTC has come up with a cheap method, if you already have a vernier gauge, using a section of old 2mm. spoke bent round so it contacts either side of the rim, I am still trying to track down his instructions, but here is a picture that should make it fairly clear:
Chris says rim failure is around 0.5-0.7mm. so replace anything at or close to 0.7.