Improved approaches for users to with graphical user interfaces of computing devices are disclosed. The connection forces the tube to expand applying pressure against the coil spring and forcing it to expand and exert radial pressure against the tube towards the inserted tubular portion. The tapered etched ends further comprise a SERS-active metal substrate deposited thereon effective to create a uniform SERS enhancement for an analyte or other substance of interest. The sacrificial oxidation process oxidizes a portion of the newly thickened SOI layer, converting it into an oxide.