on my past film I noticed 'light fogging' from my 'Gift' RTS II Quartz -- well I had done the mirror foam - need two pieces to allow for the interchange of focussing screens but this time it was the door hinge foams -- I wet it with some lighter fuel and scraped off the rotten foam with a pointed wooden ice-lolly stick and cut some strips from an 80 pence hard foam sheet I got in 'Hobby Crafts; shop in Romford ( Essex) and fit the new strips and door shuts well and NO light leaks !