Topmusicanswers
The bow hair on a violin bow usually consists of some 150 to 170 strands, so if individual hairs become loose or tear, there is no need to have the violin bow rehaired right away. This is a normal sign of wear and tear and has no effect whatsoever on the playing characteristics of the bow.
Why is my bow hair so loose?
When the environment gets very humid, the hair on the bow will stretch. This could cause a lengthening of the bow hair which might make it difficult to tighten all the way. If this happens, DO NOT continue to tighten your bow past the resistance that your tension screw will give you!
Why is my violin bow not tightening?
If the hair is simply too long, sometimes a luthier can shorten it. Often it makes more sense to rehair the bow. When the hair length is not the issue, two other reasons for a bow not tightening are a failed plug and a failed knot. ... Occasionally when a bow won't tighten it's because the eyelet is stripped.
