Can the gear knob be repaced on K11

The one fitted at the moment is chewed up for some reason, trying to undo it like a regular knob is not working. the rubber sleave is just spinning as though it cant grip the thread.

Only a couple of other jobs needed before i get it on the road, put the electric window back on its runners thanks to a search here, only had some silicone so left the door card off, will get some epoxy if it fails. Doesnt seem to sit in the plastic runner that well.
 
Mine took ages,finaly hacked it of only to find a plastic stopper that the gear knob was molded on to,this was put on by superman! I had to carve the stopper into a recangular shape so I could used an adjustable spanner on it,have fun :)
 
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