To prepare EGaIn microspheres, 0.18g of EGaIn (obtained from Alfa Aesar) is sonicated in 0.75 ml of ethanol for 30 min forming a greyish emulsion. 67 Subsequently, 10 µL of the emulsion is pipetted and drop casted on the SAM substrate to be studied. Once the ethanol (VWR chemicals) has evaporated away, we approach a suitably-sized droplet with a tipless cantilever (MikroMasch HQ:NSC36, k = 0.5-5 N/m) with a setpoint force of 5 nN. We found that slight shearing while in contact with the droplet helps to release the droplet from the substrate, which can then be picked up easily. For tunneling experiments on SAMs, we replace the droplet after performing electrical characterizations after every 3-5 junctions.