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For reproducing it has been found that glasses of .0045, .005, .0055 and .006 give the best results. It is well to procure several of each size and try first one and then the other until the best one is determined. It is impossible to state the exact size to use, as all re- producers vary, and while a number .005 will be suitable for one, it will not be for another. In purchasing glasses it is always advisable to get them accurately measured and if possible measure them yourself (using a micrometer). They should be of a uniform thickness; some you will find are wedge shape, or thicker on one side than the other, and this makes them useless. Now, supposing you have obtained the glasses mention- ed above, remove your reproducer from the arm of the machine by releasing the clamps which hold it in position. Unscrew the clamp ring and remove the tube plate, this leaves the glass exposed but still held in place by the con- necting link and crosshead which is cemented to its center by means of stratena cement (25 cts. per bottle, at all Phonograph dealers). To loosen the crosshead from the glass take a match and dip it in water, allowing a drop of same to fell directly around the junction of the crosshead and glass, allow this to set for 10 or 15 minutes and then remove the limiting weight screw and gently pull up on the weight itself, the water loosens the cement and a slight pull will detach the crosshead. Now remove the glass and examine the rubber gaskets which act as cushions for same. If they are soft they may be used again, but if hard they must be replaced with new ones. Before inserting new gaskets it is well to dip them in french chalk as this prevents them from rotting and also