For anyone who wears the same style ventilator or cpap mask I do, some of those acrylic chain links and two swivel clips can replace the manky blue elastic pretty easily and requires no tools beyond fingers to assemble. The chain links have a little opening you use to snap them together.
I took my mask off with the elastic at its usual tightness and made the chain clip the same length as the elastic and then adjusted it accordingly. I think the total cost of a variety box of acrylic chain links and a pack of swivel clips came to $20 and I've made a BUNCH of different colors with it. The only chain I didn't get from the one box of links is the rainbow one and those links were like, $2 at either Walmart or bimart.


















