Between the extra-long jig axles and some clamping tabs that I etched into the frame pan, installation of the bearing guides was a walk in the park.
I had been a little concerned that the jig axles would be a loose fit on the bearings. As it turned out they were a little snug, and I even had to sand one down a hair to slip the bearings on. I liked having the long 1mm sections at the ends as they helped keep the coupling rods on when I bumped the assembly. Next time I will taper the ends slightly to make it easier to get the coupling rods on. Having said that, because everything is a good fit, the dry fit assembly held together without clamps.
For #10, I fashioned some springs to hold the bearing guides against the frames while I soldered them in place. This worked fine, but the tabs in 622’s frame pan held the bearing guides steady relative to the frame, not just to the bearings. They will be removed along with the rest of the pan soon.