I finally acquired what I consider to be one of the prettiest folding cameras made, an Agfa Billy Compur, circa 1948-49 Agfa Billy Compur This model was top of the Agfa Billy range of folding cameras using 120 roll film, a series that ran from 1934 to 1949. It has the fine 105mm Solinar f/4.5 lens and the rimset Compur Shutter with speeds from 1 to 1/250th, though I believe there were a few examples with a 1/500th top speed. While these specifications indicate that this is an example of the second variant of the Agfa Billy Compur, it lacks the "Compur" name stamped into the leatherette, and the double exposure prevention device. There seems to be dozens of variations in the Agfa Billy Record/Compur range of cameras. While this example is in very good condition, it suffers from the common problem of the focusing being rendered immobile by the ancient Agfa green grease. The front element is immovable in the helical. I have sorted this problem with other cameras by removing the two front elements contained in the focusing helical and soaking them in solvent for a prolonged period; I have had success using naptha (lighter fluid) and also denatured alcohol (methylated spirits). I know other members claim success by placing the unit in a hot oven until the grease softens, but I'm just not too keen on that idea... Does anyone have any new advice to offer, before I make my move?