The E5TQ/E6R1 Series RDE/RRDE ChangeDisk Toolkit is an essential component of the electrode. The toolkit makes disk insert installation, removal/ejection, and polishing possible. While there is no physical way to load a disk insert into the electrode tip, this toolkit only makes physical contact with the very outer aspect of the disk insert. Users that routinely modify the disk insert surface with material (e.g. catalysts, inks, polymers) have reported success in using this product, despite the contact the toolkit necessarily makes with the disk. The exception to this success exists for very fragile/structurally unstable layers/materials on the disk surface, where the surface contact between disk and tool may be undesirable. The toolkit also includes a PTFE polishing block, into which disk inserts can be installed and hand-polished.