[Torrey, Daniel]

I designed and made a spacer to go between the top of the piezo assembly and the NAC 2125 piezo (2 mm thick) so that the mirror is within the piezo base and the piezo can be centered with the centering tool I previously made and the #4-40 nylon tipped set screws. The spacer is 0.75" OD, 0.469" ID, and 0.226" thick. I designed it to be 0.21" thick (see photo), but this came out a bit longer because I thought I would have to machine the surface to get it smooth. Instead, parting at 400 rpm gave a nice surface finish.

I measured the inside of the piezo to be ~0.468". It fit over the 0.46" diameter part of the centering tool, but not the 0.47" diameter part of the centering tool.