Good point but we replaced the bands and panty hose after every day of use. The inviroment was pretty dirty that we were flying in. At the end of the flying day are planes would be coverd in dust, but thats the only place we had at the time and we were learing, so we had cheap arf trainers. I admit now if i thought i needed a filter on my engine i would just buy a manufactured brand. We just got some used panty hose and had a bunch of little rubberbands so what the heck.
ORIGINAL: shakeelsid
It may have worked for you, but to me it sounds like a dissaster waiting to happen - rubber bands and oil do not go together well.
What if the band came loose right at takeoff, full throttle, the filtermesh sucked in to either lodge in the spray bar (if you are fortunate) and immediately effectively cut the engine out. If you are really unlucky, it could go all the way in the chamber. Either way it could ruin your day.