20 to 30.5mm adapter for 20x20 flight controller with 2.5mm holes

After getting this:
http://www.banggood.com/Betaflight-3_1-F3-6DOF-Mini-Flight-Controller-20x20mm-Integrated-OSD-Built-in-5V-BEC-p-1119503.html?rmmds=myorder

I found that it has 2.5mm mounting holes instead of the usual 3mm. It also had some pads very close to the mounting holes. So this is my modification to fit this FC.

Print in TPU/TPE, preferably with a second object so the mounting nubs don't get too melty.

Note that it may take some force to get the nubs to slide in fully. I used