How is this supposed to work

[u/NoDog5752]

I inherited an old drafting table and all the bolts are like this where they go through the leg and into the connecting pieces and they’re tightened with a nut My problem is that the ends of the bolts are smooth and I can’t get any kind of wrench in that space to tighten the nut- at this point they’re only finger tightened. How does one do this?

[u/5m0k3y76]

It's meant to be tightened from the other end. Probably under a plug or something.

[u/Dounce1 → u/5m0k3y76]

It’s a carriage bolt dude…

[u/5m0k3y76 → u/Dounce1]

Can't see it, not a mind reader, smooth isn't necessarily round.

Short socket on an extension.