Good day to you all . I stripped my hipolito 502 and I had great difficulty undoing the bottom half of the generator unit .I sort of checked that the foot valve was moving up and down ok . So I continued to overhaul the lamp with existing parts ( parts on order ) I got to the dunk test and no bubbles !! .by the way the gauge was not working. I thought great .then realised It lost pressure . The leakage was from the nozzle needle . cut a long story shorter , I plucked up enough courage to undo the bottom half of the generator valve with a set of mole grips and a good wack from a hammer . I was afraid of the tank distorting . So the moral of this thread is. Check the foot valve pip firstly !!! saves a lot of bother. The parts arrived today got the pressure gauge (manometer ) fitted . held pressure very well I changed the lead washer on the pump nrv it was a loose fit , this did not work seems to be to large . I suppose a bit of a flatten with a hammer might reduce the orifice size . and the actual pump is a bit hard to use takes a bit of energy . I will work on the last two issues tomorrow but in the meantime any tips for them would be helpful.