[spdbrake]

Mine are oringed in. I use a taped up cold chisel and tap - walk them out.

The pin drive nuts use a 12mm allen.

A set like this will work.
[ame]https://www.amazon.com/gp/product/B007UQLQQ4/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1[/ame]