I have had fiddles in for repair with machine heads replacing the pegs. was able to wind the pegs with a guitar peg winder. Some peg winders ae smaller than others. I am sure you will be able to find one with a bit of shopping. I shall look and see it there is a name on the one I am using. If the machine heads are of quality, one or two turns around the post should be sufficient and the excess string can be clipped off. Any guitar winder could be cut down and modified for this purpose.