I've noticed that the Bowden cable on my 1987 300D Turbo is broken... or at least the little white twist end of it. Actually, it is split right in the middle of the threaded portion. Is this unit replaceable up in the engine compartment or do I need to replace the entire cable assembly? Can it be glued with anything? Is this a DIY job or better left to the professionals? Finally, what causes this adjustment knob to break?

Thanks.

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1960 MB 190Db w/ full sunroof
1985 Toyota Pickup
2006 Honda Odyssey EXL R&N
2001 VW Jetta GLS TDI