Elastic band adapter for Flex Filter (Coffee Filter) Mask

Since I have so much 3mm elastic cord (this stuff is sooooo useful), I decided to use it with the Covfee filter mask.
Note that this also works with rubber bands (you can chain some together if you can't find them long enough).

Cut your elasticord so it's not too tight (maybe barely slack). Push a loop through the strap hole, loop it around the post and push the elastic flush with the adapter. Then feed the loose end back into the strap hole and pull the strap until it seats.

It's adjustable! If you need it tighter, just push from the back side and feed more elastic cord through, repeat all the above.

I'll try to get a picture to clear things up.