If you have the newer style of Spring Arms (implemented summer of 2018) skip to the next step!
The spring arms consist of an inner and outer halves that retain two of the R4 bearing rollers you assembled in Step #2.
Set two R4 bearings on the inner spring arm as shown in photo #2.
Press fit the outer spring arm on to the two small posts protruding from the inner spring arm. The fit is very tight, but they will fit!
In order to fully seat the pins once they're started in the holes, you can tap them in using the back end of your screwdriver as a hammer.
Assemble three complete sets.
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