Russell and All – The NSR replacement chassis’ I received run two different grub screw sizes. The lower grub screw is the standard NSR sized grub screw while the upper one is a Slot.it sized grub screw. When installing the lower NSR grub screw it feels like it’s too big and will break the chassis but they do fit. The chassis will budge out a little but that is the correct grub screw to use. There are no issues with the upper grub screws.
I don’t know if this is consistent with all the chassis but it is for the three replacement chassis I received. Of the three chassis I purchased – one green and two white – the green one did not come with grub screws but both white ones did. The screws that came with the chassis were two different sizes.