All my checkering tools, handles, cutters, spacers etc. I purchased from Brownells. I agree with previous posters about Kennedy's book, not much info. on checkering. The only plus I found is proper stock layout.
My grandson (17 yoa) is learning to checker as we speak, I think he will be quite good at it in time. He's practicing on some old stocks I have, the main trick IMHO is going around a curve and keeping things "even", on a flat surface not that difficult at all.
JM$.02W --- John