How did you remove your caps? I'll have to look that video up.
I removed them by gently applying some downward force on the while rocking back-and-forth until they broke free.
Just be careful while you’re replacing the keyboard. Those standoffs are fragile! The biggest thing is to not over-tighten the screws. I just simply snug then on my two (a 145B and 170).
Cool you have an Apple case. Those aren’t too common I don’t think (as they probably cost more than a contemporary aftermarket case when new). And yes, no system disks were shipped with the 145B.
Here’s a little tip: even though the 145B shipped with 7.1, it CAN run 7.0.1. I actually just installed 7.0.1 on mine the other day. It does incorrectly show as a 140 to the System, but otherwise it works great.
These machines definitely have some design quirks, which is slightly compounded by almost 30-year-old ABS plastic, but with some care and maintenance, they are really nice. Some of my favorite 68k machines for sure. They are also quite easy to take apart as well.
I also think they are some of the best-looking laptops Apple ever made. They just have a great, simple look to them.