Could you modify the current DIN plug by adding some tape to it (might need to be metallic tape for the shielding to work) or making a cut and spreading the shield to increase the tension? Another option might be some sort of tie to hold it in place but this could be difficult due to its location. 
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Cars...
'93 Audi Coupe 2.0 Alpine White (sold)
'99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold)
'00 Audi S8 Agate Grey (Sold  )
'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ)
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