ok so with my joye 510 I ordered some fluxomzers knowning they have cracking issues. I ordered so extra tubes for this and after having some crack on me I set out to fix this. well I looked at the way the plastic fits around the metal and saw that as u tighten or loosen the platic will slide over the metal grooves weakening the material. To stop this from happening I applied super glue to the metal and slid the tube back on, this stop the tube from turning and flexing. the tube would normally last a few days and then start to crack but with the glue added at the base I am on the ame tube for almost 2 weeks with no cracking. and I am still able to remove the tube, all the glue does is fill these grooves.