Like most people here, I like to change the strap on my Speedmaster from time to time. Recently, I have been changing the strap more often and I have noticed that the springbars offer less resistance. Maybe it is that I am getting better at this task, but I have started to wonder if springbars will become weaker with frequent strap changes. If so, do you guys replace them from time to time to avoid failure? When you replace them do you use OEM springbars or aftermarket spring bars? Finally, where would one buy OEM omega springbars?