I love my 100 and have had little trouble since I bought it except that I had to adjust the regulator in the beginning. After it had been sitting for 6 months it began leaking from the tiny bleed hole in the valve block. I stripped it and fitted a new set of seals but it kept leaking. I tried two new polyurethane O rings on the fill valve that I purchased off the evil bay but still leaked. Taking a closer inspection I found that the internal diameter of these seals seemed too large. Hunted through my seal collection and found a very hard seal with a smaller I.D. to fit over the fill valve where the cylinder screws on. Hey presto its been standing for a week with no air loss. Thought this might interest 100 owners as you cannot always trust new seals to be a correct fit.

Baz