+1 To Rob Heyes comment. I had the same thought.
One of the first things I ever printed was the PRUSA Maintenance Stand, which safely holds the printer upside down. Made this part a lot easier.
It would be nice if there was something holding it in place.
I to used my pliars to gently screw the PINDA into place.
I'm very impressed with the quality of the assembly guides. The only significant improvement I can suggest is to perhaps add 3d images that can be rotated for some of the trickier spots. 3d animations for some procedures might be easier to follow than video.
Try threading nut onto long bolt halfway. Then insert nut into place using long bolt as handle. Screw other bolt on from the other side until it engages nut. After a bit of practice, you'll be able to feel it when the bolt has captured the nut and you can unscrew the long bolt. This is how I got the nuts on the bolts connecting the PSU cover to the support on the Y-axis.
There are some additional tools that may help:
- diagonal cutters - to clip zip ties
- lump of plasticine clay - used to temporarily hold nuts in slots -painters tape might work as well
- flashlight - used when plugging in electronics
- calipers - used to check measurement from Y-axis corners to vertical metal frame
You can get by without them, but I found them useful.
You can also use one of the smaller hex wrenches to prop the PINDA holder open enough to move the probe. Gently work it into the slot at an angle. Don't pry.
I too have been using bits of plasticine clay to hold nuts in place after spending too much time on the floor searching for the one that just fell out.