I came across what looked like, superficially anyway, a good condition fat boy for a reasonable price. Unfortunately there are some significant mechanical issues: The blade gap is uneven from left to right (I know how to fix this by gently bending, but have left for now) The TTO does not work properly. On most occasions, the bar linked to the doors fails to gain any traction from the TTO knob i.e. you turn the TTO knob and it just goes round. When it does gain traction intermittently, the razor doesn't lock down properly and the TTO knob will turn round indefinitely. Cosmetically it's in a good shape and doesn't need a replate. The razor is an E4 and therefore can be dismantled easily. I have done this and de-gunked the razor. Inside there is just one obvious fault. The TTO knob has a fairly lose fit and can easily be pulled off by hand. I can't however see a direct link between this and the symptoms as it should be academic when everything is tightened up. The spring seems to be tight and I can't see any other obvious issues. I've looked at various tutorials by Captain Murphy and others, but can't find any obvious solutions. Does anybody have any suggestions as to what to try / look at or failing that, do we have an active repairer in the UK at the moment?