My grandfather took up the hobby of turning wooden pens on a lathe, he's quite experienced with woodworking though. He has a problem when turning ginkgo, its so soft that small little chips of it will rip out. No matter how much he tries to sand it, this always happens and it's never perfectly smooth. He's reluctant to make ginkgo pens because of this problem, though I want one. Are there any suggestions to things he could do to avoid the chipping problem?