Omega cal.552 Mainspring replacement

[canthus]

My vintage Omega Seamaster with cal552 movement is coming up for a service (which I do myself).  Last time I didn't replace the mainspring (it runs fine and keeps good time but the amp is a little low) and have since obtained a NOS genuine Omega replacement mainspring. When I remove/refit the mainspring is there a slipping part as the cal552 is an auto-wind?   Is the slipping part integral with the new mainspring in the holding washer or does the old spring have a slipping part that needs to be re-used/replaced?  Any help much appreciated.

[oldhippy]

Here is the movement parts list in pdf. All I see is the spring, so I don't think there is an extra spring that fits inside the barrel and then the new spring catches on to it.

365_Omega 552 NewLR.pdf

[oli]

Yes the slipping bridle is attached to the mainspring, and both mainspring and bridle are constrained within the holding washer

[oldhippy]

9 hours ago, oli said:

Yes the slipping bridle is attached to the mainspring, and both mainspring and bridle are constrained within the holding washer

I couldn’t remember, its such a long time ago since I serviced watches. Thanks for clearing that up.

[canthus]

Thanks guys, just wanted to avoid hang-ups when I get round to it.