Thanks,
I was already at that id while poking around when I did:
mdb.models['Model-1'].rootAssembly.instances['mybolt-1']
k=inst['mybolt-1'].__members__
>>> print k
['analysisType', 'cells', 'datums', 'dependent', 'edges', 'elemEdges', 'elemFaces', 'elementEdges', 'elementFaces', 'elements'...