Road Fan and Grand bois - I had difficulty with a bearing cage on a thick cup once - It may not have been the cup but after that I just went to loose balls all the time - The deal on the 5s-B is just something I hit on when making transitions form cottered cranks on French bikes - Its not "The Way" its just "A Way" to do it for a few bucks... It all seems to work but maybe I have been just lucky - All in all it was very nice to get away from the cottered crank and allowed a greater variety of cranks to be used... Its all been allot of fun... And none of them have failed...