Scheduled for 15 hours of operation?

Bought in 2010 and used a small fifteen hours at most.
Fissure of the lower part of the block, cast aluminum (Controls Head), specifically over the entire thread length which is screwed element that sends water to the exit.
Almost designed to make it loose: thin (+ thread ...) and screwing tapered seat for many prestressed and high pressure in premium.
Given the forums, I am not in fact the only in this case. The room cost 64 euros on the internet, plus ...

Otherwise, it works fine, except that I was never able to use the variable starts at max power (stop / relentless march despite a good water supply).

I wrote in Karcher, wasted effort, they remind that there is a customer service but do not want to know anything. Case pending with consumers services and DGCCRF.