Ender 3 7mm drag chain mounts

To mount heat bed 7x7mm drag chain such as this:
https://www.ebay.com/itm/Machine-Tool-7-x-7mm-Cable-Carrier-Drag-Chain-Nested-N9M2/253377190049?epid=1195520298&hash=item3afe7518a1:g:Ax8AAOSwUH5aYO4S

Holes are made for 3mm brass thermo inserts

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