If it's the same movement, I still have 2 spare ones! Happy to send you one.
Hmmm... a bit of a religious discussion here. I used to do it your way, until my master watchmaker, from whom I take tuition, showed me how to do it the way I do it now. I'd say your chances of smearing the oil are just the same if you oil the jewel rather than the cap. In both cases, you have to place the cap in the middle or you smear the oil.
It's not really my way, but a common way (pretty much any book on watchmaking recommends it). There is a zero chance of smearing the oil, because it is inserted through the jewel hole while the cap is already in place, screwed in. There are 2 ways of getting the oil through the hole: 1) by dropping oil in the jewel cup and then pushing through with oil inserter, or 2) by using a special oiler that can reach through the hole.
That's an extremely generous offer. To answer your question I popped it open to learn that it's a front loader like the one you did, and I don't quite feel skilled enough to risk hurting it for the next step of removal. I know it won't help much, but here's the front, opened up. I'll PM you later on if I get the nerve to go further, or I'll ask my watchmaker. I would love to pass it on well-kept to a niece or nephew someday. (It currently runs beautifully still, but it hasn't been serviced in 30+ years so I only wind it a few turns about once a year to keep it from stiffening up.)
Looks very similar, but not the same - almost looks like you got a more round / oval movement there. Nevertheless, the mainspring I have fits the calibre 980 and 982.
