This wolf eliminator chrome- or brass- plated is available for violin / viola, cello or doublebass.
It is one of the oldest methods to lower the wolf to make playing possible again. The damper has to be fixed at the affected string between tailpiecehanger and chevalet.
Assemble as follows:
You can get a major effect by switching the damper to the side of the chevalet, also by tightening the screw with power.