The fixed spindle of my new reel design is a piece of stainless shaft material that holds a bronze thrust washer against the reel back plate. It is secured by a custom screw with a large head.
I did not want to put any screw slots or drill holes in the spindle or in the screw, so I needed another way to adequately torque this connection. I made this soft jaw (aluminum) wrench set.
The small wrench is for the spindle, and fits inside the reel frame.
The larger wrench holds the screw.
Together, they lock the spindle in place tightly so that removing the spool retaining screw should not loosen this joint. At final assembly, the connection will get some Loctite.