For anyone on the fence about paying $90 for that key way from Factory Pro, it is worth the money. Bike idles better, sounds better, you can feel a definite power increase specially In the mid range.
I used this tool from Amazon, worked perfectly and with a Prime account was at my door in 2 days.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1