If all you wanted to do is adjust the bearings, you can do that from the left side of the hub. You just need to fully tighten the right side bearing cone against the axle locknut before installing the adapter. Also, if these are solid axles that mount with track nuts in the dropouts, you can adjust the bearings with the wheel mounted in the frame. Just keep the right track nut tight and loosen the left nut so that you can adjust the left bearing cone. If you want to clean and repack the bearings, however, this will be a problem.
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