What is Reddit's opinion of 10Pcs PCB Print Circuit Board Carbide Micro Drill Bits 0.3mm to 1.2 mm?

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That looks amazing. You did a great job. I love your fabric choice.

Also, if you think 1/16" drill bits are small, you should check out micro drill bits. One use for them is for drilling small holes on PCBs. These on Amazon are metric and go from 1.3mm down to 0.3mm. For reference, 1/16" is about 1.5mm.

yeah, T-BB18 is what i was thinking needs to be drilled from behind. the issue with the needle from the front is you can damage the part of the plastic that is holding the ball in place. before i got the drills i was able to use a sewing needle and a hammer to pop them out from the rear, but it is a lot more work to hammer through all the plastic with such a delicate tool. i would totally recommend getting the drills, they are super cheap, just something like this https://www.amazon.com/10Pcs-Print-Circuit-Board-Carbide/dp/B00IMXHXGG you can find them on ebay or wherever as well. looking at my T-BB18 here it should be pretty straightforward, just drill behind each bearing with a tip smaller than the width of the bearing, and once you are thru the plastic, you can push it out (needle may come in handy there, no need to break your drill bits). the new ones should pop in from the front.