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Am about to change wheel bearings, and found this handy/cheap method on youtube. Copy and paste the address below into your search field, there is also a link down the bottom right of the video to get a longer version.
It uses a 20mm Anchor bolt (masonry plug/rawplug) 120mm long - you can see similar in the video - not sure what you call them.
I tested it first on an old bearing , a mate had lying around. At first I thought the video man must have used an Imperial 3/4 inch. The bearing i.d. is 19.97 mm on my vernier and the mushroom head of the bolt slides in with a little leeway. The expanding collar wouldn't fit thru by hand, but a few taps with a wooden mallet and it slipped in. My bolt is by Ramset and has two collars. I removed the plain nut-end collar to get room to hold the bolt by the thread while tightening the nut. 
Had problems trying to put the link here. So amend the following - youtube.com/watch?v=t7VQnNfqJtA
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