tDCS electrode adaptor for rodents

this is an adaptor for tDCS experiments in mice. it should be filled with with saline solution (NaCl 0.9%) before the stimulation to establish a contact area of 3.5mm2
I've designed it according to the one described in the paper "Pedron, S., Monnin, J., Haffen, E., Sechter, D., & Van Waes, V. (2013). Repeated Transcranial Direct Current Stimulation Prevents Abnormal Behaviors Associated with Abstinence from Chronic Nicotine Consumption. Neuropsychopharmacology : Official Publication of the Amer