[MBZ] 648 injector hold down bolt

[Kaleb Striplin via Mercedes]

I am replacing the number 1 injector as it is returning too much fuel.  
The hold down nut has a nut on top of the hold down piece using it as a 
spacer.  This is also the case on #5 and 6. Apparently the bolt does not 
go all the way into the bore.  I have cleaned out the hole, used a small 
screwdriver to try and dig out any crud in the bottom of the hole and it 
seems like it is hitting metal to me (not crud).  Still the bolt will 
not go in all the way. I am wondering if there is a piece of broke off 
bolt from a previous repair down in hole, which is why it feels like the 
screw driver is hitting metal at the bottom.  If its not actually metal 
and a whole bunch of crud, what is the best way to clean it out?  Small 
drill bit ran slowly down the bottom?  If its a piece of broken bolt, 
what about that?  I do not really like the idea of using a nut as a 
spacer on top of it.

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