if what you say about the owner is true.. then just take one of the old loose balls to any decent bicycle shop, match it up and buy a bag. clean up the races really good, pack with grease, preload to spec, and send it on its way. Yes, tapered rollers are a ton better.. but really, only if you are a bit of a hotshot rider. (I am going to get roasted for this advice.. so keep watching)