The holes are there to allow for the outer race to be pushed out in case the bearing fell apart due to lack of maintenance. When the bearings are intact you can push against the inner race. I own multiple Norco bikes and I always use the RRP bearing press when swapping bearings. Keep in mind that pushing against the inner race can actually ruin the bearing so that's why you should take them out only when they are worn out.
I agree with your preference to avoid hammers of any kind, when possible. The double-stacked bearings you pictured are not really in a "blind" situation because you can get to the back side of them. Therefore, you can use a bearing extraction press to remove them in a controlled manner, something like this:
Both bearings come out the same side so the bearing the tool is pressing on will push out the other bearing. A bearing press in guide then replaces the small red extraction guide so that the outer race takes the pressure of being pressed in. As previously stated by HuckingKiwi, those notches are for using a punch to extract a stuck outer bearing race, should the bearing disintegrate during extraction.
If the bearings you pictured actually were "blind," your blind bearing puller would be a better choice for extraction than a punch and a hammer in my opinion--but it's not relevant since you can use a press tool.
We moved away from having a dedicated tool for each bearing size because it's too expensive and the tools were too bulky. With the new system, you can get into very tight spots and use some of the same guides for multiple bearing sizes. For example, one 10mm Inside Diameter extraction guide can be used on 4 different bearing sizes
There was a similar bearing on my Spec enduro, except there was a section of frame in between both of the bearings, flush with the inner race, which made it totally impossible to remove the bearing. It was a disposable frame-member (seat-stay) due to this. I was so pissed when I realized this, with blind bearing tools, there was no way to grab these bearings and pull them out, no lip, the frame material in between them meant you couldn't pull them out, etc. Insanely bad design. But then again, that's how Spec designs bikes, sell them now, F-all later on.
I like the look of the budget altalt, and that RWC Modular Bearing Tools is a beautiful. I'm going to have a go at building my own extraction tool. I already have a set of alibaba bearing press adapters.
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