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Originally Posted by Cory
If you're using pillow blocks bolted to the T-slot, and not a through hole in the extrusion, you can slide them in the slots.
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this is exactly what we did. every loop of chain has at least one sliding component. kjhobin of Team 555 alerted me that 80/20 does not recommend this method, as the t-nuts are liable to loosen and slide, but we haven't had this problem yet. Another option would be to add a tensioner sprocket to the t-slot and just slide that.