hiwin rail question

[EddyCurrent]

Eddy
Think what siliavski means is drill the end of the rail along its length offset so you don't intercept a securing bolt drilling, then drill down from the top of the rail to intercept the hole, drill & tap the end drilling for a nipple, so home all axis and grease six nipples, never seen the 15mm rails up close but you might be able to get a 3mm hole in it & that should be more than adequate for wheel bearing grease.
Regards
Mike

Thanks Mike (and silyavski) I understand that now and it sounds like a good idea. Both ends of the rails would need to be drilled.
The important thing is where to drill the exit hole in the rail, need to study some diagrams or remove a bearing to see what's best, maybe it needs more than one hole in order to reach all the races ?