I don't know if anyone posted this before or not but I made a foam hole cutter last night that worked out perfectly. I have been using an adhesive backed foam to seal the flash on my cameras latlely. 3/8" foam. I took a piece of the steel sink drain (the drain trap- straight with an elbow) that is 1.25" diameter, sharpened it on the belt sander all the way around. locate the hole you want and push down and twist. Cuts a perfectly round hole with nice sharp edges. I cover the entire inside of the camera compartment door above the sensor with it, covering all the glass and sealant. Dosen't work any better but it really makes it look nice. much quicker than using a knife or sisscors. Any thin walled tube should work just as good.