The trombone is one of the most delicate of musical instruments. It cannot be built heavy enough to withstand bumps and falls and still be light enough for effortless performance. The outer slide of any trombone has the lightest metal of any musical instrument, ranging from .007 to about .012 of an inch thickness. When it is realized that this is only three to four times the thickness of a human hair, it will be clear why a trombone should always be handled carefully, protected against bumps and falls, and placed in its case when not in use.
Assembling the Instrument
The first step in assembling your instrument is to lubricate the slides. This should be done every day when breaking in a trombone, then as needed. There are two ways a slide may be lubricated. A few drops of slide oil may be put on the upper and lower portions of the inner slides. Wipe the inner sides clean of dirt with a lint-free cloth anytime before applying oil. Work the slide back and forth so the oil spreads evenly over the entire slide.
GENTLY place the mouthpiece into the receiver and twist lightly to seat it properly. Do not force the mouthpiece by hitting it with the palm of the
hand as this can cause the mouthpiece to become stuck or ‘frozen.” An easy twisting motion is all that is necessary to insure a firm fit.