I have used a couple of sets of these capsule/key cartridges with good results but lately have had a stubborn clog. I removed these so I could install a set of cleaning cartridges, using a brand new set of IJM refillable carts containing Piezoflash. Now normally when pulling a set of carts it's been recommended here to put some tape over the vent holes and place the carts in a ziplock bag. But where I'm stuck is how do I put tape over the capsule's air vent, it's hidden by the key. It doesn't seem practical to pull out the capsules, cover the air vents, and stow the capsules in a bag without the key. Or am I being lazy?!
So far I've only done the procedure once, putting the capsule/key carts in a bag and running a few cleaning cycles with the Pieozflush cartridges. I didn't see much improvement in my nozzle checks, but I've also read here to give it 24 hours. And it may take several 24 hour sessions to clear the clogs. Meanwhile... are my capsule/key carts drying up, with the air vent uncovered? They are at least protected with a ziplock bag.
Just as an aside... I found the markings on the capsule a little confusing... shouldn't the label's arrow point to the air vent? And it's not really a "protective plug", is it? (picky, picky, I know!)