I've got a thingumybob clamped to my clutch pedal, it seems it's job is to prevent the clutch pedal being pushed all the way to the floor:
In an effort to see why the gear changes drag sometimes (as if the clutch wasn't pressed fully) I thought I'd screw in the bolt that holds it away from the floor. It was on it's last couple of threads so I removed it fully. I haven't noticed it dragging since, but it needs a more extensive test.
I was wondering if anyone else has this kind of device on theirs? Anyone know if it's necessary? I believe the clutch is an OSGiken single plate.