I used the longeron bending dies from Larry Buller (NDrv8r) as guide blocks for drilling the rear spar and they worked great. They are 1.5" wide which is the perfect size. Four progressively larger holes up to the .311 reamer.
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Larry New
RV-7A - Flying 900+ hrs
RV-10 - Flying 2.9 hrs 48 States in 7 Days!
VAF Paid - Annual Autodraft