Here's another idea for a motor:
http://www.mpja.com/191VDC-82-RPM-Gearhead-Motor-Used/productinfo/18609 MD/
And a suitable power supply:
http://www.mpja.com/12-Volt-Plug-In-Power-Supply-1A-Hon-Kwang/productinfo/19466 PS/
The motor has a 30-tooth steel gear on the shaft. What I'd do is take a short chunk of 3/4" I.D. heater hose, and make 3 or 4 slits down the sides, so that one end can spring open to accept an ampule. The other end gets secured to the gear using a worm-screw type clamp. You may need to cut a couple of slits in the gear end of the hose, too - so that it can slip over the gear. You could use some rubber bands to increase the holding tension on the top end if required. Build a small stand for the motor out of some wood scraps.
http://www.mpja.com/191VDC-82-RPM-Gearhead-Motor-Used/productinfo/18609 MD/
And a suitable power supply:
http://www.mpja.com/12-Volt-Plug-In-Power-Supply-1A-Hon-Kwang/productinfo/19466 PS/
The motor has a 30-tooth steel gear on the shaft. What I'd do is take a short chunk of 3/4" I.D. heater hose, and make 3 or 4 slits down the sides, so that one end can spring open to accept an ampule. The other end gets secured to the gear using a worm-screw type clamp. You may need to cut a couple of slits in the gear end of the hose, too - so that it can slip over the gear. You could use some rubber bands to increase the holding tension on the top end if required. Build a small stand for the motor out of some wood scraps.