Looking for gear reducers for electric motors

Many electric motors come with gear reducers built in; some can even be ordered with one of several different gear ratios. But these do
not seem to be ammenable to aftermarket tinkering--you can't remove the gearing from a motor, or substitute gearing from a different motor. Does anyone know where to look for second hand or salvaged reducers that are self-contained, and can be attached to an existing motor? What sort of junked equipment might contain reusable gear reducers? (We have access to a lot of equipment auctions.)
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China Shenzhen ZHAOWEI Machinery & Electronics Co. Ltd engages in designing , manufacturing and marketing all kinds of electric motors. They are mainly suitable for the following applications: smart home application used in sm art kitchen and laundry, medical instrument for personal care, smart E-tran smission applied in automobile, industry automation applied in telecommunic ation and a great variety of plastic/metal planetary gearbox in different s izes. In order to develop the oversea market, we are current seeking new partne rs around the world to create a bright future together. ZhaoWei is a right choice and excellent partnership with sincere services.
Company: Shenzhen ZHAOWEI Machinery & Electronics Co., Ltd URL: http://www.zwgearbox.com/ Contact: Annie Liu Tel?+86-755-27322652 Fax?+86-755-27323949 E-mail: snipped-for-privacy@zwgearbox.com Add: Blk. 18, Longwangmiao Industry Park, Fuyong Tn., Bao?an Dist., Shenzhen 518103, Guangdong, China
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