In the illustrated embodiment, housing 210 serves as a mounting bracket for the components of latch mechanism 216. Latch mechanism 216 includes stop 220, latch 222, and brace 224 (shown in phantom for clarity). Primary spring 218 is rigidly connected to latch 222 at the top end and is cantilevered downward therefrom. Primary spring 218 is prevented from moving (leftward) to a neutral state by stop 220, which is a pin extending from housing 210. Thereby, primary spring 218 is biased towards stop 220, and when latch 222 is initially moved from the opened position towards the closed position, primary spring 218 exerts a preloaded amount of force urging against this motion of latch 222. As latch 222 is closed further, primary spring 218 is forced closer toward the rest of latch 222 and offers greater connecting force to PCI cassette 202.