Thanks a lot. Your descriptions cleared this up 100% for me, which is really good, because you only get one chance with CA glue and hinges of this type.

So using two T-Pins when you have the hole in the hinge will not only keep it centered in the slot but also keep it straight. I'll do it that way.

The instructions say to take the T-Pins out and close the gap before dropping in the CA, but if you have materials for sealing the gaps, then leaving them in has advantages for applying the CA.

Thanks this is very helpful

p.s. I included a pic of the hinge and how it has the rectangular hole. Clearly using only one T-Pin in the center (as the instructions say) would not work with these... hence the confusion.