Thanks snowdragon for the tank fix info. Was able to fix one of my 3.5 tanks by turning it upside down but not my other one that was also clogged. Tried paperclip method on the second bad tank but could not get it past a centimeter, wouldn't go any further. Finally just pushed harder and ended up pushing a coil to top of the carto where drip tip goes. Put a fresh carto in the old tank and it works great so far. Think I was taking draws that were too hard. Glad u vets are here on the forum!!