This one's for you, Duck.
Well, I'm gettin a spare engine to tinker with and it apparently has some crank trouble. Just wandering what all would be involved in rectifying this little issue. I'll be taking the whole thing apart, so getting to it won't be an issue. I'm guessing if it's knocking then the retainers (or whatever they're called) have worn down and need to be replaced. I guess all i need is a best and worst case scenario. So have at it guys.