A method for operating a hydraulic actuation system during a pressure sensor malfunction is provided. In the operation apparatus, an operation piece is manually operable to move in a linear or circular direction to a position indicative of the operation information. A shift merge operation is performed to merge the unprocessed data bits from the first data block with a second data block. As this process is very expensive in terms of time and processing power, the system and method allow for estimation of the proportion of vertices which that would be removed from the original geometry. The drill bit assembly further includes a telescoping outer tube that defines a 45 degree cut at a drilling point end of the drill bit, wherein the 45 degree cut flushes cutting debris away from the drill bit thereby substantially reducing clogging of the fluid conduction tube.