Don't worry the vice won't break if it does I will replace the frame free of charge. I set the machine for a gray shader at a low voltage like I use. 5-6 volts. Changinig springs does'nt void the warranty. That's the way I built it. I made the tube vise loose to make up for the so many different disposable tubes out there that all have a different diameters. It was frustrating when we made thase frames 3 years ago. It is made from tempered aluminum so breakage should'nt be an issue.