I see a design flaw therein. If they are turned then (usually) they will be round (although some of the things I turn do not turn out to be) The advantage of the matchstick is its rectangular cross section which reduces the probability of it rolling off the corner of the hive when being put in place. Of course an unstruck matchstick has the disadvantage of one end being round(ish).
Do people prefer to use struck or unstruck matchsticks for ventilating their hives? Should one consider the risk of spontaneous combustion, especially in hot weather when ventilation is almost as important as it is in midwinter ?
Ahh .... but you have missed my unque selling proposition ... The USP is that my hand turned, hardwood, knob ended, hive ventilation devices is that they are not square like matchsticks - they are round - but not only round - they are tapered .. so the upwards airflow through the hive can be controlled by the judicious insertion or exertion of the device, using the knob on the end, to allow meticulous adjustment of just the right amount of cold air passing through the colony to keep the bees shivering and shaking and thus using the masses of sugar syrup and fondant that they are being fed on.
As long as they are inserted, one on each side, at equidistant corners they cannot roll ... simples ...
I will have difficulty keeping up with the orders I feel .... I may have to subcontract ...