its a little sledgie hammer that i used and you are hitting far away from glass. The motor sits on bracket that hangs and will ABSORB the hit , the motor part does not touch the rear wall. DONT HIT IT WITH ALL YOUR MIGHT. Tap hit it. IF you were to remove the rear seat and open and close the window, you will notice that the braket will flex back and forth. The Motor hangs in mid air.
99 F250 5.4 mods 05 bumper,grill, 05tt mirrors
2006 5.4 supercrew lariat Medium wedgeblue/arizona beige
Pwr/rear slider, audiophile ,console shift, Mods- Ford tow hooks, 09 Ford pwr signal/ht/puddle Trailer Tow mirrors, 08 Ford rear entertainment system (slim RSE)
08 Ford Navigation radio