Tea Infuser adapter for pint glass

I broke the original coffee pot that came with my Piao I Gl865 Infusion Tea maker and have started using pint glasses which work great except for one thing... When I put the tea infuser inside the pint glass, it slips down a little bit too much and is a bit hard to pull out with my scalding finger tips. So, I made this thing to adjust the diameter of the rim to about 90mm.

Here it is in action:

https://youtu.be/AkJsD2xkGUQ

Now, you're probably thinking, "Waitaminute there, Mr. 3E8, pi