I have an old 42# recurve I bought 10 years ago. It is still a shooter. I was thinking it was light for hunting. I can start with that. I need some arrows. How do I determine the correct spine for a 42 # bow at about 27.5 inch draw? I have some cedar shafts left over from 10 years ago. They have been in my studythe entire time. Should I use them? I don't know what they are except that 10 years ago I thought they were the correct ones.