4" snack block

[metric_taper]

Do you use a thrust washer to keep the pulley centered between the plates. I know there is near no axial force on the pulley, but are you keeping it centered via the bushing being press fit, and using a shoulder bolt to prevent the plates from squeezing the bushing? I'm asking what your stack up is to keep this from failing. You have worked on lots of stuff, and kept those good packaging ideas.