I'm trying to fit an Incabloc shock spring ( 975.03) to the lower balance jewel on an  AS 1950 movement. I've managed to replace these kind of shock springs twice before, but they took me a LOT of time and effort - I ended up building a ramp of Rodico, and sliding the spring down it.  This one has defeated me so far. Should I be able to fit the spring with the setting in place, or do I have to push it out a little ? I've tried it both ways, but so far unable to seat the spring pro