motorcycle speedometers - http://www.motorcyclemaintenancetips.com/motorcyclespeedometers.php
Arduino simulator 1.4 EN
Arduino Nano based Microbot
tailwind trailer suspension
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Bob Harris' hub puller to remove the rear axles. Lots of ideas here for other potential uses.
Ring Roller - Homemade ring roller constructed from threaded rod, bar stock, steel plate, and bearings.
New DIY Wireless Telecontrol Three-wheeled Smart Car Robot Kit for Arduino 2.4G #Adeept
Hybrid GOAT ROBOT 22T Evatech's 8MPH mower can be manned from 2,000 feet away. It takes on 70-degree slopes at and also has a snow plow implement.