I've bought hgh25 lineqr bearings with z0 preload ie. no preload at all and I don't like the feel of them; the machine I'm building is heavy steel structure and I think the bearings would be the weakest link.

Since I can't source pre-loaded bearings in my country I'm thinking of doing it myself. But I'm a bit suspicious that the process is as easy as just putting bigger balls.

I can't find anyone doing this on the internet and I can't think of why? I lot of people are doing it with their ballscrew nuts...

I haven't measured the balls yet, but I can't find how much bigger the balls are on the z1 and z2 preload bearings. Do you have any info on this?

Any thoughts and opinions on this?

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