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After tuning your fiddle a number of times you may notice that the bridge is beginning to lean towards the fingerboard. This could result in your bridge falling or warping. the following words and illustration are not mine but seems to sound advise. This method of correcting the problem by David Gesset could be useful to you.
The safest way to adjust the bridge without danger of pushing it over is performed in the following manner.
Sit in a chair and place the instrument across your lap with the scroll to the left. The right index or middle finger should be extended under all four strings from the far side.
The left hand is positioned comfortably around the strings to the front of the bridge with thumb at the center of the crest of the bridge between the centre two strings and the middle finger braced against the end of the fingerboard.
With the right index or middle finger slightly lifting some of the tension of the strings off the bridge, the left thumb can gently push the upper edge of the bridge the required amount into the cushion of the right index finger.
The finger doing the lifting will act as a stop so that the bridge cannot actually be pushed over or too far (see illustration).
Picture and Text by luthier, David Gusset
Seen it all. Done it all. Can't remember most of ..... What was I saying????