Makes the foam really easy to use. Gives you amazing control that you can never compare with a regular tin can and straw. Works just like the original. With a little practice and a YouTube video, you can get the result you want. Much less frustration than the alternative. Read the instructions. Connect it. Work out. Get the job done in much less time with far fewer words you don't want kids to use. I wonder why you thought foam was such a problem. Clean the beast properly - may take longer than using it. Be happy knowing you can touch it up the next day if needed because it's so easy and you don't have to throw the jar away the day you use it. I have found that the practice period has given me a good idea of how to adjust it for the desired bead size. Once I felt it, it was easy to use. When the glass is on top there are places that you can't easily reach because of the corners so you can do the exercise in test mode and see if you have any problems with gaps with the glass. It works at moderate angles, but not upside down. Remember this is an expanding foam - you can wait and don't try to fill it all at once as it will expand for a few seconds. Conclusion: It's worth it for the control.
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