This brings up a topic that deserves mentioning briefly.
I think that unless you plan on owning/keeping a keyboard for life that you owe it to the next owner to keep all components that come with a keyboard. I do it by nature but I have found that others don't. Discarding a part that comes with an instrument just because you don't use it or think it's important is not just inconsiderate but it devaluates the keyboard significantly.
I recently bought a Yamaha 9000 Pro from UD that he described as "mint condition". It was my fault that I assumed that description meant for the keyboard and all factory-provided components, but when the keyboard arrived it was missing several factory items, most importantly the music stand which is a critical and nearly irreplaceable part for me. The music stand is not a seperate accessory item but one that comes with the instrument from Yamaha and is unique to the 9000 Pro. Dave had discarded it, but not completely - it took about a month for him to find it in his kitchen utensils (from moving). Once I got the music stand it was scratched and beaten up - not at all in the same condition as the keyboard. The music stand is a very visible part of the instrument and it was a terrible let down to see this beautiful shiney like-new keyboard with an abused stand on it. I'm working to replace it now - but I've learned that other people don't value everything that comes with a keyboard as I would... so next time I will ask detailed questions about what comes with my purchase before buying from anyone, even from this forum.
At the same time - you should keep and protect all factory components to a keyboard as a basic courtesy to the next owner and to retain the instrument's value. What you don't use or care about may be a vital component for the next owner, especially if you intend to "rotate" keyboards often. I don't want to get into a debate with Dave over this (we had several private ones already) so I've made my point and would just as soon drop the subject.
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Jim Eshleman