A follow-up.
Lots of solutions and diversions. Back to the OP - followup.
I have the Avery back set. 3/4" in dia at the plastic, 1/2" for the driver.
I took a small section of rib stiffener and measured, the rivet centerline is only .070" off center (.180 from the edge). The set is flat, so no wedging effect. There is another problem occurring here. The OP needs to adjust technique, equipment, pressures or other variables to fix the issue. Learning is part of the process. Knowing something can be done sets the goal - this can be done!
Now is a good time to practice by varying pressures and trigger time. Count the hits, hold the gun differently, quantify the results. I hold mine upside down with my palm over the center axis and pull the trigger with my middle finger. Develop your own technique, one that works for you consistently.
Alternatives are good, but won't overcome developed skill. A skill which must be improved to complete the airplane.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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