What planter and style bearing ? Older JD planters with stub shaft bearings that attach to the arms can be tricky to get drawn together squarely. Previous post I made with links to my IE album on this.
https://talk.newagtalk.com/forums/thread-view.asp?tid=93009
For the other style with a pass through bolt style bearing you may find a press style tool helpful. This poster has ads in the classifieds here for this style tool. https://talk.newagtalk.com/forums/thread-view.asp?tid=686526 Video of tool being used. https://www.youtube.com/watch?v=LRdETkSlae4
I also see where Shoup is offering a press also.
https://www.shoupparts.com/P2000-Tire-Press/ Others opinions on Ag Talk vary I just never had good luck stomping them together and getting them to run without wobbling. I wanted them to run as close to straight and true as I could make them. Edit: Once they are mounted stick them on a jig in the vice to evaluate how true they run. 
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What’s the easiest/best way to press a Deere gauge wheel back together?
