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Here are some helpful videos for builders that are new or need a refresh on forming ribs and riveting. Note the order in which things are done. First, flanges are bent in form blocks. Second, lightening/stiffening holes are flanged. Last, the rib is fluted to get it straight.
Flanging with form blocks- http://www.eaavideo.org/video.aspx?v=1801255269
Flanging lightening holes- http://www.eaavideo.org/video.aspx?v=1817719343
Straightening rib with fluting pliers- http://www.eaavideo.org/video.aspx?=1844687103
How to install wingtips using hinges: http://www.matronics.com/wiki/index.php/Attach_Wingtips_with_Hinges
Drilling out pulled rivets- http://link.brightcove.com/services/player/bcpid1431564069?bclid=1432790122&bctid=1472379714
Drilling out driven rivet- http://link.brightcove.com/services/player/bcpid1431564069?bclid=1432790122&bctid=1657896937