Fix broken Vacuum body
I find plastic solvents like Weldon 4 work better for plastics the cements take a long time to cure and in my opinion weeken the plastic. On some acrylic work straight methline chloride works the best. Place the 2 pieces together then a few drops at the seams wait a few minutes and make sure the solvent enters the crack all the way around, depending on how tight the pieces fit together it may be usable in 10 minutes. If the pieces do not fit well cement may be needed but in some cases it takes a day or more to fully cure.  Added weldon4 is an acrylic solvent , I have made many plastic projects with this and straight methline chloride.