When I first bought it , from a guy in london, he had had problems from new, always in and out for repair and always the fenner coupling , this been the main reason he was selling it on the cheap, he was basicly fed up with all the hassle,
Once back home and a few words with the guy who was fitting it the machine and a cpl of rails welded on for ease of in and out of van for maintanance, he noticed that the coupling were not aligned correctly , so a larger coupling and fitting in the right manner and problem solved, I have how ever had to replace the rubber insert twice in the last 4 yrs, it takes him around an hr and he sevices it whilst out ,
price £ 50 labour
Geoff