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all pistons have at least one metal tooth on the end of the rack. not because of higher spring tension, but because of the final gear of the sector gear slipping off that tooth. Think of all that built up pressure on the very tip of the tooth, it would very quickly wear it away if it were plastic.
The sector gear with the piston all the way back isn't putting as much force on the bearing as you might think, and not in the spot you might think. Don't forget the spur gear is also pushing against the sector gear.
And as much as we know about what bearings fail in what place, I hate to say it but now that I think about it, none of that actually matters. The bearings that fail are always OEM or cheap replacement bearings.
When a bearing fails in a cheaper end CNC machine, it's not necessarily because something went wrong, sometimes it's just a really shitty bearing.
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