I have been using Ambassedeur all my fishing life, back to the mid 60s. 2500c, 5000c, 6500c.
What you have to do is tear them down and put them together with very little oil and put powdered teflon on the drag washers and they will work great. I use the teflon on all my reel drags and it keeps the drag as smooth as it can be.
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"The Best Fishermen are the Quiet ones"