Came off in me 'and, 'onist mister!
What you see is a compass platform, laid flat. It should end up like the one on the left, but taller.
For some unknown reason, Trumpeter have decided to relief-etch where the bends should be but they've gone almost through, you can see the result.
I'm now trying to figure a way of sticking it together and build some mechanical strength into the flippin' thing.
Haddock.