After doing a lot of research I feel like I'm finally ready to do my first run. The only thing that worries me is a blowback while extracting since I only have the coffee filters. I wouldn't mind purchasing SS mesh or silk screen however I wouldn't even know where to look. There are tons of stores in my area such as Bed Bath & Beyond, Michaels Craft store, Home Depot, etc. Just not sure where I should go for either of these. Any suggestions or alternatives would be great. Just looking for a way to prevent/not worry about blowbacks. I also assume these blowbacks happen when the tube is too packed and not enough butane can pass through before the pressure builds up? If I were to lightly pack the tube and just use coffee filters, would there be much of a chance of a blowback? I assume I can always pack it in tighter and re-run it for some lower grade if everything works out. Thanks for the help!