I used the vice, a 7/8" socket set, and a 9/16" socket set to install bearings in both flaperon hinge bracket center sections, then riveted the unit after it was sandwiched by the assembly.
The two countersunk holes on both sides is interesting. I suspect this is intended to basically be a double flush rivet.
Today would have been my parents' -- Eileen and Fred Collins -- 75th wedding anniversary. My first plane -- an RV-7A -- was numbered in honor of them: N614EF. This plane will be numbered N612EF.