There's no guarantee that a service will resolve the issue. I own four manual-wind Speedmasters -- a mixture of cal. 321, 1861, and 3861. Three of the four wind as easy as can be, but the fourth -- a Cal. 1861 -- has always been extremely hard to wind. I have had Omega service it twice to address the winding issue and it has come back in the same condition as when it went in. I've owned that particular watch for nine years and I'd say that just in the past year it has become noticeably easier to wind.