A friend sent me a yew stave from WA State. I couldn't wait, so I removed the bark tonight and sanded down to the sapwood. But I found small hairline cracks in the grain. I can't find a clear path up the stave with them. Some are small as a hair, some are 1/32" wide by 2". Should I drawknife down to see if they go deep. Or is hairline cracks in the grain that big of deal in the sapwood?