Alex, have you considered using the machine screw inserts for wood? The T-nuts are great but if they aren't under tension they tend to fall out when the wood dries. When I drop the bolt into the hole it sometimes knocks them out and that doesn't happen with the screw-in inserts.
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I used these on a workbench in the last house. Probably use them again in the new house.
https://www.mcmaster.com/ee-slot/fixturing-track/
















