Colin, If you "banged" on the bearing(s), odds are they're already damaged. Is it possible to have threads installed outside of the bearing seat area? I don't know what your "dual-row thrust/axial bearing" type of construction is or what level of precision/accuracy you require. Personally, I'd opt for 60 degree angular contact (AKA ballscrew support) bearings for accuracy and axial support. As NC Cams explained to me some time back, double row angular contact bearings have internal clearances and therefore some end play. I do believe there are some with seperate inner races that can be preloaded but I've never used them as yet.
Good luck
Dick Z
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