[KTL]

The jack shaft bearing thread is not bad quality. It's poor packaging by Glyco. My last set I ordered came with the pieces combined in one box, so they could beat each other up in transit. I think sometimes it can be a matter of reducing packaging to simplify shipping? Reason I say that is because if the bearings are supplied as purchased, one shell individually, then you should get tiny boxes for each shell.

The Glyco main & rod bearing saga is a matter of poor quality control and the surface of the bearings are not precisely finished. However the GT3 rod bearings are very nice, and individually packaged. No worries IMO about the GT3 bearings.