So, I’ve started to reassemble my grandfather’s ETA 1080 and went about it as I always do, with the train wheels. However, when mounting the train wheel bridge I just couldn’t get the pivot of the escape wheel to reach into the cap jewelled pivot hole on the bridge (seen in the first picture in my first post above).
Scratching my head, I removed the escape wheel and inspected it, suspecting the pivot might be damaged. It was not, it looked perfect. So, I tried it again and by holding down the bridge with some peg wood, I could get the pivot to just barely reach into the jewel hole. Yet, as soon as I tried to secure the bridge the pivot would fall out of the hole. Having struggled with this for probably more than half an hour, I began to feel pretty frustrated.
I’m not a very technical person, I don’t have a lot of experience of watch repairing, and in all honesty I guess I’m not too smart, but all of sudden I realized, or rather remembered, that the jewel hole on the dial side has a cap jewel as well and that the escape wheel pivot on the dial side probably fell too deep into the jewel hole as I hadn’t mounted its cap jewel.
Said and done, I oiled the cap as instructed above (it worked out perfectly, thanks!), mounted it on the dial side and then tried to mount the train wheel bridge again. Bingo! This time around the escape wheel pivot reached into to the jewel hole on bridge perfectly. At this point, I felt pretty proud of myself!
Well, just thought I’d share in case someone else who’s new to cap jewels happens to find this thread in the future. I'll try nickelsilver's method the next time around which would have eliminated this problem.
Thank you all for helping out!