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My guess is that the original rivet is 1/8”. Or 3.2mm in foreign.  
So a 3 mm would do as a good starter if worried start at 2.5 mm or 3/32”.  

Roger will step in here with the number drill size.  #31 or #32 I think.   

 Perhaps just using a 1/8” drill to take the top or head of the rivet off that is visible then punch through the remaining stem   That way you do not drill the sill panel hole any bigger   


Peter W

Edited by BlueTR3A-5EKT
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3.0 mm should be fine.


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Hi Pete,

option 2 sounds good   1/8 to take the head off.

No'30 drill is often used for 1/8" rivets. Allows easy insertion and then a little room to expand to make a perfect fit.



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