Check out this site...www.solopetdoors.com They will sell their motor for 108.00...... a bit pricey, but looking doesn't cost anything....so far the electric auto antenna seems the best....most motors have a nylon belt rapped inside to push-pull antenna....junkyards are full of these....specially if you don't need the antenna part, just the motor and nylon strap.
Happy Hatch'en
Happy Hatch'en