https://www.amazon.com/dp/B003SBMXXU...a-306302376361
I have this one, and I love it. You do need to be careful when you insert the blade initially, so you don't nick it, and it won't fix a nicked one, but it has saved me when I was at retreat. I do know that I can be very stingy with my blades, and truth be told, they are really NOT that expensive and a sharp one really does make a difference in accuracy!