Disclosed herein are various embodiments of a capacitive touchscreen system that is capable of sensing simultaneous or near-simultaneous multiple finger touches made on a capacitive touchscreen. The master cylinder also includes a cylinder wall associated with the master cylinder housing extending axially along the cylinder axis. For example, control of the RF phase difference may be used to control one or more of average etch rate, etch rate uniformity, etch rate skew, critical dimension uniformity, and CD skew, CD range, self DC bias control, and chamber matching. 20 \u2003\u2003, and H15 denotes the number of protrusions per unit area on the surface of the magnetic layer that have a height of 15 nm or greater ). The first split bearing facilitates rotation of the flap portion and comprises a first bearing portion, a second bearing portion and operative bearing components, wherein access to the operative bearing components and the seal assembly is obtainable by separating the first and second bearing portions from each other.