RE: Rossi .15 Spinner
The OS 15LA also has a 5mm shaft. OS has a spinner nut which "SORT" of fits. I have three right now and each seem to have a poor fit to the threads. They work but you have to be careful not to strip them. If anyone knows of another light weight spinner for a 5mm shaft I would like to know. There are some other 5 mm out there but they are the heavier style.
DickB