[MPWR]

In 1/24, it's really impossible to tell whether small dia clear line is tubing or if it's solid. So happily things like monofilament fishing line or sewing thread look just as good.

Or...

You can take a straight section of clear sprue several inches long, and gently melt the center with a flame. Carefully pull the ends apart, and you have your own styrene monofilament. You can make it to whatever diameter you need by varying how fast you pull.

Paint it with transparent clear colors if desired, or with clear flat for a translucent look.