Instructables has an excellent tutorial on making a prosthesis out of a soda bottle which can be fitted with various "terminal device(s)" such as a paint brush etc.
"In resource-limited areas worldwide, individuals with amputations may not be able to gain access to prosthetics devices due to a lack of the materials needed to fabricate them. This simple technique utilizes a 2-liter soda bottle to create below-the-elbow prosthesis suitable for a number of light duty activities.
Please note well that this technique is intended for use by trained prosthetists and it is intended to be preformed only using a plaster cast of the residual limb."
For those not familiar with Instructables, it's a great site where people create and upload tutorials on various topics. You can learn how to solder, create a bird house as well as some other projects I wouldn't advise taking on. Always an interesting read, even if you don't try them out.
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