The invention is a security holster configured for use by left-handed users, with a release tab on the left side of the holster, a locking tab on the right side of the holster, which generally engages the ejection port of a gun, and a linkage between the release tab and the locking tab. Interference is also sampled at the sensor sampling frequency. A lock washer has a lower surface with an array of radially extending engagement teeth. The top of each photodiode has a separate contact formed thereon. The dynamic sampling rate adjustment process includes comparing a predicted process outcome and an actual process outcome and modifying the sampling rate based upon the comparison. These wing parts in their active position are located on the top and optionally also on the bottom of the wings and are shaped for example such that the wing parts located in their active position on the bottom of the wings jointly with the wing parts located in their active position on the top of the wings increase the lift and optionally at the same time change the angle of attack of the wing.