Good pics Cory. If you mean the silver handle with the disc, that's the throttle lever, incorporating the gun sight range adjuster, on the twist grip. This suggests that this particular aircraft was fitted with the MkII GSGS gyro sight at some time (the one from which the American K-14 was copied, under licence).
On the starboard wall, immediately aft of the instrument panel (Pic 3), is the British radio channel selector (five red buttons, Studs A to E), and behind that, what looks like the IFF destruct, possibly with a Morse key at the front, but not sure on that.
Hope this helps.