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As usual i largely disagree with what has been said mainly about the two arms length stuff.I can speak with some authority as i have 4 tunnels and they are all different, for different reasons. One is 1.9 m (6.3') another is 200 mm (8") and the other is a double decker 2.8 m (9.3') long and i have used 3 different construction methods which suited the situation at the time. The little one is two overlapping holes bored through a concrete (cement) wall. The double decker was a cutting betwen the pool pumphouse and the back fence, that we covered in and the other is most interesting in that i used a 220 mm (9") plastic storm water pipe and i cut a 150 mm (6") section out of one side over its entire length and that become the bottom through which the track passes.The amount of trouble i have with 3 of them is not worth talking about and if anything gets stuck i send my big Mallet through and it will push just about anything out and in the rare occasion that doesn't work, i use a bit of wood and push it out, even a mop used backwards will do. The other one the storm water one; i did have trouble with but it was my own fault as i didn't do the job properly in the first place.Rgds Ian
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