Guess this was due to the poor quality of the spring bar, because I never had any problems with 20 mm spring bars on my speedies. Are the lug holes still in good shape? Perhaps this had something to do with it as well? Anyway, try using a proper spring bar from any local jeweller and ask for one that will give a tight fit between the bracelet and the 47 end link. And it should be 20 mm with strong springs.