A method and apparatus for a uniform resolution display screen. Additional cutting elements may be placed in the cone of the bit surrounding the centerline thereof. The bushing assembly consists of at least two bushings and one pin whose dual purpose is to govern the forward movement of the ring and to absorb the force that is being applied to it. A track is located near the top portion with a compressive ram being mounted in a frame which is moveable in the track between the bailer compartment and the compactor compartment. As a result, an indexing time period is minimized, a size of the device can be reduced, and easy maintenance can be carried out. A voltage follower circuit included in an integrated circuit oscillator provided to is injected with a base current provided by a current mirror instead of a capacitor such that variations in the base current of the bipolar transistor over the range of operating temperature do not substantially alter the charge in the capacitor to change the frequency of the oscillator.