taking out headlight dimmer switch?

[kulturekat]

i did a search but couldnt find anything on replacing or how to get the dimmer switch out of the dash. i know i unscrewed the bolt holding it in from the front i got it loose but is there a notch or something on the back side that i need to do to get the knob to come out of the unit? i got new gauges and bezels and stuff to replace but cant get the wiper or dimmer switch out to change the stuff. thanks in advance