No, this whole thread has been converted to a classical "maybe -- what if" thread.  As such maybe it should end about now.



The original poster understands the purpose of the mod but was simply seeking a way to know when it is time to do it.  

He also was asking about rebending the guides, which I do do and have seen some minor lasting benefit but not enough to avoid a Slaggy extra hole.   I did see enough benefit to get me back to a zero origin on the extra hole (bending only took out the guide surface wear effect, that's about all)

Mileage is still the one good way to know when you have to do the extra hole, you still have to pull the side cover and do your first check at around 15,000 miles (or whenever you need to go in anyway to fix a push rod length if that is earlier).  

13,000 miles mebbe isn't too early if circumstances work out that way, it just gives you more wiggle room before the ovaling of the aluminium housing starts.   Earlier than that, you may not have enough room for the extra hole yet.

Your "fail" check is always when the cam chain slapping noises start.

Simple enough, original poster's question has been answered plenty.

I've sold verslavies to people whose bike has gone tap happy at... I think as early as 5k miles.

So be aware, teach your ankles to listen and get a mech's steth and listen to the engines happy sounds before she gets ill.