Hi. I am collecting the pieces to assemble the ar2 and the being from Spain, because asking for things from the United States is very complicated due to the issue of customs costs. That's why I'm looking for bearings in Spain. The bearing of J4 and J6, with a shaft diameter of 1 "and outside of 1-9 / 16" is impossible for me to get here. The one I found is the AXK2542, but the outer diameter is 42mm, and the one used in the manual, 1-9 / 16 " outside in mm are 39.7mm, could the AXK 2542 be mounted on the unmodified pieces?
The J4 bearing are inch standard size. To use other bearings would require modifying the models.