SELF LEVELING JS SAX PADS WITH COIL SPRINGS
JS pad springs make installation of JS pads a snap. You must request coil springs if you want them with your pad set. The pad must be free to fall in and out of the cup without friction. Place a small dab of hot glue on the back of the pad in the very center. Quickly stick the coil spring into the glue before it cools so that it is perpendicular to the pad and let the glue harden (do not heat the spring). If it doesn't come out right the first time then remove the spring/glue and start over. Cut the spring to approx 1/8" length after it is glued into place. Now place 4 small bits of glue in the empty cup at the maximum diameter. Warm the glue in the cup and drop in the pad. Press the pad into the cup just a little and hold it in place while the glue cools. With the key in the instrument and lightly closed on the tonehole, warm the glue to a liquid state and watch the spring try to push out the pad so that it automatically levels itself on the tonehole. The pad should not be forcefully bottomed out in the cup while the glue is molten or it will not come out level. Move the cup up and down slightly while the glue is still molten so you can see the pad move in and out of the cup a little to make sure that the pad is not bottomed in the cup. Then hold the cup perfectly steady during cool down. A wet rag applied to the cup will help speed cooling.
When setting up cups that are linked together with mechanisms - start at the bottom of the right hand and work upward, leaving out the upper pads till last. Repeat with the left hand starting from the bottom. When you hold down the lower touchpiece and heat the upper cup that is linked to it - the upper pad will automatically adjust itself because the coil spring will automatically take up any loose clearance.
This method works on JS pads because they are flat and have a stiff backing. It doesn't work on octave pads and may or may not work on small diameter pads or pads that are way off center on the tonehole. The pad can be just a little light in the front opposite the key-hinge but should close completely with light finger pressure. If the pad does not cover perfectly then you must carefully apply heat only to the area that you want to correct (don't overheat) (see Gold pad install video).