Just a quick note to let you know disassembly, cleaning, and 10x inspection is complete on your Bentley. Plenty of pics attached. Please note in the pics that I disassembled EVERY single piece down to the last screw. Every spring, screw, and all the tiniest parts were completely stripped from the mainplate and bathed/rinsed in the ultrasonic machine. I like to point this out, because there are a LOT of pieces on this most complex of all A7750 movements, and I don't skip any step. The press-in pivots were all removed, even the copper jumper springs are removed, and they will be lubed upon reassembly.
The movement overall was totally filthy. I found hairs, thick sticky oil where it doesn't belong, grit, and most strangely the remnants of some bug that was squashed between the mainbridge and chrono jumper spring during assembly. I found legs, what appeared to be a wing, and a couple of nasty brown dried-out smears. Yuck!
Anyway, the parts have been cleaned and inspected, and so far everything looks good. I will know more during reassembly; it will be a few days before I get to that.