How to prevent grub screws from damaging outer diameters

[thehomeengineer]

Hi Marv
Thank you for the alternative options on material selection. I have never used lead but I have used aluminium in the past.
As I am going to have different width, rollers running in bearings I did not want to machine flats on the shafts. This was purely to ensure the bearing would always have 360-degree contact to shaft. Also not using a flat means orientation is never a problem. So many times, I have gone to move a collar and the previous person has not quite lined the grub screw true to the flat and this chews the edge of the flat/shaft and both the bore of the collar and shaft become damaged, making moving the collar difficult if not impossible by hand. I think both methods have their merits.
Thank you again for viewing
The Home Engineer