After replacing the grommets of a racket, I see that there is one thing I don't like about electric machines. The last grommet or 2 of the mains tends to try to pull out when stringing the last main. With a crank, I can pull really slowly to make sure the grommet doesn't pop out and leave the string exposed to the frame. With the electric, it just pulls. If the grommet pops out, you have to be quick to keep the string from getting u against the frame too much.