Follow up of:

https://blender.stackexchange.com/questions/196575/how-to-remove-duplicate-verts-after-spin-tool

How can I add bolts onto an existing mesh? If I create a separate object (as a single bolt) and duplicate it so that it looks like the inner part of the rim (ITALIERI) below:

[![enter image description here][1]][1]

how can I merge them with the existing mesh so that there are no ngons? Additionally, the new vertexes will also inherit the subsurf, right? meaning that each needs an  extra edge loop or crease.

[<img src="https://blend-exchange.giantcowfilms.com/embedImage.png?bid=8V53GwlE" />](https://blend-exchange.giantcowfilms.com/b/8V53GwlE/)

  [1]: https://i.sstatic.net/zwwrK.jpg