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another source to get them- at least here in the US is auto "junkyards". cars with push button adjustable seats have them. im pretty sure that place sends internationally. if not, and you cant find one locally; let me know. i can order it and send it to you. would be a little more on...

they would be better than the first- heavier contacts are typically better. where they blades are solid instead of having the slot cut typically makes a bit more force to push them - but they usually dont wear out as fast.

they should work just fine. the trick is in the mounting of them - i dont have the greatest machine tools, so i drill a hole and file it for adjustments (its not as bad as it sounds). if you have access to a mill you can cut slots to make it adjustable.

this is your incubator, so build it as you want. but a warning from experience, stay away from PLC's and electronics in incubators. when they fail you can never get the parts you need quick enough. your design idea will work well, but will be costly to keep up; adding to the cost of your...

the eggs will be counterbalanced, leaving 35kg or about 72 lbs. you can use a different actuator for more weight but it will cost you more money. this same setup will turn 2000 eggs with no problem. overall cost is about $75.

component sources: timer motor :http://incubatorwarehouse.com/egg-turner-motor-110v.html linear actuator (pictured black and gray): http://www.surpluscenter.com/Electrical/Linear-Actuators/DC-Linear-Actuators/1-5-STROKE-250-LB-12-VDC-LINEAR-ACTUATOR.axd switches are available at radio shack.