Estrol

I ve had my mc21 crank rebuilted recently with new bearings and with no problems.It is really good balanced, better than before i could say.Anyway you will have to split the crank to remove the rod.No the connecting rod isn't one piece with the bearings and lastly no company has ever made undersized big end roller bearings for the NSR.You can get more info on the tech place here on NSR world.