+1
Go for toothed wheels and bands to keep it all in sych.
I'm waiting on the belts.
Motor
http://www.aliexpress.com/item/24RPM...589957986.html
Speed Controller
http://www.aliexpress.com/item/PWM-D...388412090.html
Shaft Pulleys
http://www.aliexpress.com/item/10pcs...589238470.html
Motor Pulleys
http://www.aliexpress.com/item/5pcs-...336088316.html
Belts
http://www.aliexpress.com/item/free-...384550219.html
Got enough coming for 5 double sided units.
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