The acid test as to the suitability of the rods is when you have your 'spider' together and secured to the tower carriages. At that point you can try to manually move the effector to see if there is any play/flex. Given that you have six rods to share the load and the effector is extremely light you shouldn't have any issues. As you say, it's a simple swap anyway if it proves problematic. The tubes I use have OD 6mm ID 4mm so. 1mm wall thickness. They are perfect.
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