Joe,
By far the easiest way is to set the dies what you guess is a little too far apart. Squeeze the rivet, and check it out. It should be not squished enough, so turn the plunger a half a turn, and give the rivet another squeeze. Repeat until the rivet is set properly. If you got the complete Avery kit, it included a set of rivet gages, so you can use these to test the rivets for proper shop heads.
Sometimes a particular die set will be required for a special application, but most of the time it really doesn't matter which flat die or cupped die you use, as long as it fits the rivet.
The Avery tool kit is great, but I highly recommend adding a longeron yoke and a no-hole yoke. There are some rivets you cannot set properly without these (I ended up using some pop rivets on the empennage; now I wish I had gotten the extra yokes sooner).
Pat
__________________
Pat Tuckey
RV-8
Superior IO-360, Hartzell blended airfoil, GRT dual screen EFIS
Flying 1400 hours
Formation Acro SAC Card
FFI flight lead
25XS (Waxahachie, TX)
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