electrical Jbox spacer

So I was cutting some holes for electrical j boxes(octagon) when I suddenly realized I had been accidently using a 4 1/2 in hole saw for some octagon electrical boxes for light mounts that only mount into 4 1/8in holes. Fusion 360 to the rescue! Was able to make a spacer that fit perfectly! Now the lights can mount as originally intended to keep them from falling through the ceiling!

Across is 5in, so you have a 1/2 all the way around. The print is 1/4 thick but could be 1/8 in thick if you have a low profile LED light. Mine worked either way so YMMV. Hope this helps someone!