[. . . ] Avoid moving the instrument across surfaces that are sloped, uneven, or graveled. The instrument may become impossible to stop, crash into a wall, and cause serious injury. Moving the instrument up or down stairs should never be done with the instrument assembled. Doing so is a danger as parts can fall off, or you can loose balance causing the instrument to fall over. [. . . ] â· Do not use hand orchestra bell mallets or other hard objects on your marimbas. When assembling/disassembling the instrument, do so with at least two persons and follow the instructions outlined in this manual. Assembly in the wrong order can cause the pipes to drop which may result in an injury, impair the performance functionality of the instrument or cause noise. â· After final adjustment of the legs the fixing screws must be tightened securely to prevent loosening. Looseness may cause the instrument to shift during performance and can also cause noise and other problems. Before moving the instrument, make sure that the caster brakes are released. Also make sure to lift the instrument slightly when moving over rough surfaces. â· When the instrument must be transported to a different location, disassemble it to the same state as when it was purchased, taking care to pack each component properly. We, at YAMAHA, aiming principally at beautiful sounds and playing ease, have made strenuous efforts in creating the outstanding instruments and selecting high quality materials, and successfully developed these marimbas. We are convinced that you will enjoy playing your instrument that produces spreading and yet deep sounds as well as rich volume to your content. Please read it thoroughly to ensure that your instrument will give you enjoyment for a long time. For safety, the instrument should be assembled by at least two persons in a location with sufficient space. We recommend to you to assemble the instrument on a soft rug or carpet. * Before proceeding to the next step, make sure that the slide guide fixing bolts of the large and small end legs are securely fastened. Loosening them will cause a sudden rise of the frame end which is very dangerous. Align the letters and fully insert the stays into place, then tighten the wing bolts. Connect the slant stays (2 on the large end, 1 on the small end) to the leg sections. Slide the hook on the end of the stay onto the bolt on the leg section and secure it firmly in place with the wing nut and washer. The joint for the square stay is labeled with a "J" and the joint for the round stay is labeled with an "M". Connect both joints at the same time making sure both are fully inserted, and then tighten the wing bolts firmly. [. . . ] Contrary to step q above, the resonating section of the tube should be shortened, or in other words, the regulator should be set further into the tube. , three people are ideal for carrying out resonator adjustments; one person to strike the tone bars, a second to adjust the regulators, and a third to signal the sound quality while listening from the audience area. â· Excessive noise between the cord and tone bars can be eliminated by slightly loosening cord tension. Always adjust height with two persons, making sure that both treble and bass sides are parallel. [. . . ]