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Additional note w/r/t "second" method
If you are going to block one cylinders motion with another perpendicular cylinder, and side loading is an issue, the perpendicular cylinder can be used to position a plate (or something else) to block the motion. The load should be taken by an external bearing. This was what I was reffering to in the original post, when I stated a linear bearing can be added.
One of the easiest ways of doing this is to have a simple plate, which will be placed in the path of the extending cylinder. This plate, which can be sliding in the channels of 2 parallel sections of Bosch extrusion (or be sliding on some other form of linear bearing), is moved in and out of the blocking position by the second cylinder.
Hope this helps with the side loading issue.
Scott358
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