Thanks,

Lots of good ideas,
I don't have room to put a couple of drive wheels so it looks like I 
will have to go chain drive of some sort, off to price bicycle chain. I 
don't want to use limit switches to stop the gate as I want it to open 
and close quickly and therefor want to accelerate and decelerate smoothly.
The water idea is nice but the gate is 500m from the house and water is 
precious to us as we rely on rain water only.

regards

Lee McLaren
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