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We are using t-nuts to attach parts and plates to the extrusions. These t-nuts slide inside the extrusion.

The Bear Upgrade 2.1 comes with custom designed t-nuts that can only be inserted in the correct orientation.

If you use Openbuilds hardware or other kits your t-nuts need to be inserted in a certain orientation.

Tech note: our new t-nuts reduce the chance of damaging the frame, have a longer and more precisely machined thread and being manufactured from stainless steel, they are rust free.

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