DIY Spherical Rotating LED Kit POV Soldering Aid

So when you build this thing it all goes according to plan until you get to this arc of LEDs, then the frustration sets in.

No problem just print this spacer, wrap a ruler with tape backwards (sticky out), stick it to the table, tape the spacer to the arc PCB, stick the LEDs to the sticky edge of the ruler, shove the arc up to the LED and tape down, you now have 2 hands to solder them on.

I had a problem with the pads on the board not being at the edge, if I would have thought about it at