Maplenoll Ariadne missing air valve for platter/ tonearm

Hi

I had just purchased a maplenoll Ariadne table

its missing the air valve at the base that controls the air flow between the platter and tonearm. I have no idea why the original owner eliminated it. 

can anyone please send me a pic of the table base, or inform me how do I install it. 

i hope that someone will find the time helping a fellow audiogon who is desperate.

Thank you