Logically, since it worked before glueing and is not working after, the culprit is how that piece was reinstalled. Changers like this are (to me) a Rube Goldberg nightmare and I avoid them like the plague. I never could understand the disassembly/reassembly order and procedure. I, in fact, marvel at those who can strip one down, clean and lubricate, and reassemble successfully.
Good luck
Shelly_D
P.S. I'm not trying to be snarky or anything, just saying these things mystify me.
There may have been another part in contact or meshing with the one you glued up that is now in a different position or orientation that is at fault. Or some part may have been holding a third something spring loaded in place, and with the removal of the repaired part, the second part no longer held the spring loaded one in place and now that third part is misaligned and can no longer do what it needs to. Changers are just chock full of mechanical contortions like that, which is what drives me to run from them screaming like a madman.
Shelly_D