Aussie,I have never seen a bearing drop straight in except when hub is heated and bearing chilled. About .001 inch should be enough to hold it firmly. With the hub clean is there visible signs that the large bearing has been moving in the hub? It maybe spin marks or polishing where the bearing outer was moving. If it has all is not lost. By your measurements it is 'at size'. Hubs have been knurled in the past to provide a raised surface to reduce the inside diameter. There are also various bearing race locking compounds. Look at the hub as a whole for other damage, how are the sprocket holes and spoke holes. Is it a brake drum as well and is it worn. Maybe it is worth replacing with new hub.
If you have let the bearings get too bad the hubs will be flogged out. You should be able to go to internet to find out the bearing dimensions. I can't see how the small bearing goes in if it is large than the hub.
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