I'm not a pro either but I take a pair of tweezers and push the tubing onto it, carefully heat it with either a heat gun or lighter until its soft and carefully open the tweezers up to gently stretch the tubing. This works very effective and only takes a few seconds. @tomekk I tried a 1000mw laser before getting the 40w laser and it did etch the acrylic, it was just really poor quality and could not handle what I was trying to accomplish. It's worth investing the $300 into the 40w laser as everything on it is upgradable. I posted about my experience with it back sometime in July of 2016.