Help with Boyar Schultz 618

I double up the needle bearing to cover more surface on the shaft. It’s already machined for it.
 
Needle bearings are cheap, be sure to use the inner hardened roller. Todays plastics like Delrin or Nylatron could also be used. Give it some clearance on the id like .002". No need to press fit it. A sliding OD with some green loc-tite to anchor it.
 
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