Vibrato Markings

Hi again,

I am inputting a handwritten score into musescore. Throughout the score, there are these 'exaggerated vibrato' markings in different sections (I have attached a photo of the markings, they are highlighted in yellow). I am wondering if anyone has any suggestions on how these markings can be easily created? I have tried to create these markings using a variety of lines, but the lines go out of place very easily so I end up having to re-align them again and again.

Thanks in advance!