Restraining Bolt for R2-D2 and Other Droids

While this is technically not an accessory for the dome (or a remix of it) I thought it would probably make the most sense to post this here. There are a couple of other restraining bolts on Thingiverse, but I wasn't quite satisfied with them. In particular, I wanted to include the knurling on the base. Plus, this seemed like an object that my relatively modest modeling skills could handle. I made it in Tinkercad. I originally just guessed at the dimensions, but I was given some accurate numbers