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I don't have holes on my leadscrew bearings either, but I just dribble oil on the sides and it lubes fine. This is neither a high pressure nor a high speed situation, so that's good enough.

Also, I must say there are? many fundamental flaws in the design and construction of these lathes, which were not built to last but to sell . . . cheap. If you want to improve them, fixing those things would be better uses of your time.? For example all the machined surfaces on the lathe (except for the top the lathe bed) are machined sloppily, so the headstock isn't necessarily in alignment and the tailstock is almost never in alignment. Also, the? underside of the bed is so crudely finished (at least on older specimens like mine)? that the factory had to fit an idiotic spring-type keeper system to the carriage to keep it from flopping around (which people have to constantly fiddle with). Finally, the cross slide has a very restricted range, there's no carriage lock, and there's no back-gear, making it impossible to have full torque when turning slowly.

All these flaws have been fixed and how to do it is here. With so many worthwhile improvements you could make, using brain cells to improve the oiling seems a waste of time.? As far as I can see, the oiling system is one of the few systems on the lathe that's not seriously flawed.