So I guess you had to align them with the reflector on, and then lift it back off verrrrrrrry carefully, and hope you didn’t bump anything.
I’ve always wondered what would happen if you used solder paste on the stars, and left the reflector in place to keep them centered. How would the heat affect the reflector? Would the lower melting temp of paste have any effect?
I would not want to leave the reflector on due to the chance of hurting the plating. In theory it might be OK, but I didn’t want to risk it. With the regular solder on the stars, I just put a dab of flux on each one, so they would “stick” to the plate when I lifted the reflector off. It worked pretty well. They aren’t perfect, but better than I had hoped for.