Very difficult door lock problem - need an expert to take a look

[Blaine]

I thought I'd be able to fix the driver's door lock on my 1992 190E 2.3 with this part that "cdplayer" from this forum kindly retrieved from a salvage lot.

However, when I tried to swap the broken tip (right red arrow), I found that there was additional damage to my lock (left red arrow).

I think the only way I can fix the problem is to remove tumbler parts specific to my key from the broken lock and use them to re-key the salvage tumbler.

Two problems, I cant figure how to get access to the tumbler and I don't have the key for the salvage lock which might be necessary to re-key.

I'd like to know if there is anybody here that knows a good locksmith that could tell me if it is possible to re-key the salvage part.

My other option is $500 to MBZ for the new part :-(

Thanks in advance.

- Blaine