I got my boat running a couple of weeks ago. I have some chatter from the driveline. There is some slack where the driveline yoke meshes with the splined end of the pump. I can hear it on and off when I am cruising. I just have a stock Olds - no big horsepower, and I would like to get through the season. I know the pump shaft is softer than the yoke, and it is probably what is worn. My question: How much slack is OK, and will this damage anything more in my pump?