To replace a violin bridge, you must first purchase a new bridge that is compatible with your instrument. Insert a bridge jack between the strings and slowly raise the jack until all of the weight is removed from the bridge once you have the replacement piece. Then, take out the old bridge and slide in the new one, making sure it’s at a 90° angle, evenly spaced between the F holes, and facing the right way. Lower the jack slowly until the weight is back on the bridge, then slide it out.
Due to the slight differences in each violin, not all bridges will fit all instruments. To find a well-fitting new violin bridge, it’s a good idea to take your instrument to a local instrument store and have it measured. While adjustable bridges are available at a variety of stores, they are not always the best option. You may need to have a violin bridge custom made if you can’t find one that fits your instrument.
Turn a bridge jack perpendicular to the existing bridge between the D and A strings. Move the jack as close to the violin bridge as possible, keeping the screw to move the jack between the D and A strings and, if possible, holding the two bridge and jack together with your fingers. Slowly raise the jack by twisting the screw until the strings’ weight is supported by the jack. If you feel the strings are under too much tension, gently loosen them to avoid snapping.
Slide out the existing violin bridge once the jack has held the strings in place. This may require some maneuvering depending on the age of your instrument. A violin bridge can settle into the instrument even if it is not glued down. When removing the bridge, be gentle and keep an eye on the jack to prevent it from collapsing. The jack is supporting about 40 pounds (18 kilograms) of pressure, and if it collapses, it could seriously harm your instrument.
After removing the old bridge, replace it with the new one. Most bridges have a slight incline to them, with the lowest end intended to support the E string. Make sure the bridge is aligned with each F hole at the same distance. Unless your old bridge was out of place, there should be little adjustment needed if you placed the jack in line with it. The new bridge should be as close to 90° to the instrument as possible.
Slowly lower the jack using the screw at the top once the violin bridge is in place and butted up against it. Gently turn the jack and slide it up through the D and A strings once the strings are resting on the new bridge. Retune your instrument after that.