Follow Van's advice. Don't be afraid to put a new flange on the rib. Simply cut off the flange and add a new one.
As mentioned, never drill through a rivet. View the EAA video on rivet removal.
As a side note, insure your work is held firmly while riveting. Many errors in riveting are caused by a poorly supported part.
For what it is worth, there are no hi-loks, cherry max, oops rivets, bolts, or other hardware in my entire airframe used to fix a mistake. Almost without exception you can repair any damaged part and put it back with the same construction and type of fastener. I made plenty of mistakes but chose to repair the parts as new rather than use other types of fasteners. Personal choice.
Get your hands on AC-43-13b. It is downloadable as PDF's or you can still order a copy. It covers many different recommended practices for repairs, acceptable standards, etc...
Keep moving forward. You are doing fine.
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Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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