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The advice about same length tubing given above is quite sound.
We had a fair size cylinder operating a moveable punch on a large press, with slightly different sizes of tubing, and before it would operate properly the tubing had to be just so.
However, you might want to consider different rates on both cylinders. Just remember to use flow restrictors on only one end of each cylinder - one end's restrictor interferes with the operation of the other.
It was nice to read in the First forums, that First finally admitted you didn't need two/cylinder, mounted on the cylinder as stated in the pneumatics manual, and ignored so successfully.
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