What should I do if the bench drill always misaligns the beads when processing them?

Should I use a Buddhist bead knife? If so, it should be done twice by Yamashita. My approach is, after the first semicircle is completed, turn it over and align the drill bit in the wood with the drill bit. Do not drill immediately, but slowly lower the handle. If it goes smoothly, it proves that the position matches. If it doesn't go well, it means the upper and lower parts are in different positions. Then slowly adjust the position and angle of the wooden block. Although it takes a lot of work, it has a high yield, so you can try it.