I've noticed over the years that my decade+ old Nilfisk 130 was getting stiffer to assemble and disassemble. The last use a few days ago was almost impossible.
I was about to go to Argos and get the latest C135 but I thought I' have a closer look at mine.
After some poking and prodding I noticed that the small rubber O rings were very stiff, almost plastic like.
I replaced them and it's like it was when new, easy to assemble and disassemble. Just clicks together
Proper Job.