Attach old wine barrel with glass plate

Yes, but that was not intended at all. He was asked for tips on how to attach it.

Sometimes you are allowed to come up with counterproposals that the original poster does not even recognize. That is what a forum is for. So if the groove of the barrel is 3 cm, you can place a 1 cm thick glass plate on the pegs so that it lies softly in the groove. The fact that MachsSelbst brings his kindergarten friends does not make the problem more solvable, but rather more confusing.