I’ll assume that you checked for rotational movement of the clutch disc and found little or no play. This is great news. In order to do a through-the-starter- plince lube, one needs a special hypodermic needle to allow the lube to be placed between the shaft spline and the splines on the clutch disc. I know of one person who has one of these custom made needles and next time I’m talking to him, I’ll ask if he’s interested in working on your bike. In the mean time, rejoice in knowing you don’t have a major re/re job in front of you.