I have a Dura Ace BB-7700, which is an octalink BB. As far as octalinks go the performance of this thing is a stand out above the rest. With a weight of 175 grams and a needle bearing/ball bearing combo it performs really well. The trade off is that it is not sealed very well at all and it is a PITA to adjust correctly. Long story short I have one that I had outside 5 times and put about 120hrs on it on the trainer and somehow it has pits in the bearing race. I replaced the BB with one the LBS had on hand, but would really like to try to find the bearing race so I can repair the damaged one and have a spare. The problem is Shimano stopped making this particular BB and I cannot find parts anywhere. The way they are designed I have to think they are meant to be rebuildable and there should be spare parts out there, just not sure how to find them.