Colm, for best results you should remove the springs from your router and install it on a mounting plate. This lets you pop it out of the table for fast and easy bit changes or adjustments. This means dedicating your router to the table since it is not practicle to remove and install the springs to use it for free hand routing. You can use your router in a table with the springs still installed, this just makes adjustments a bit more difficult. You do not have to use one of the external switch boxes but having one with a safety stop paddle is a good idea.
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