i just replaced the gear knob on my car (vw golf mk3) and i get a loud

bang when put into reverse? -its manual
when i put it into reverse i hear a loud bang and then i just turn off the car, but i then tried it again and it reversed fine, then i reversed again and the bang came back, any ideas?
thanks
robert h - i unscred the gear knob and was left with a metal rod and i screw the new one back onto that?
 
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